Solid tool!!
This worked flawlessly removing my old beehive valve springs and installing my new .660 dual valve springs on my LS2.

Perfect for LS3 engine!!!
Worked perfectly! Removed old stock valve springs and installed performance dual valve springs on a 2017 Chevy SS LS3 6.2L not a single issue or problem… made life so easy and worked so smoothly

Follow the instructions paper.
Did a very good job, installed all 16 springs on my dart heads with very minimum wear, I recommend this tool to anyone

Copy of Bluegrass Performance Tool!
This is a copy of Bluegrass Performance Original tool! Not original tool!

Doesn’t work on a LS3 6.2L
Tool not made for 2013 LS3 with dual high performance springs, does not sit on top of spring retainers.

Sub par hardware
Was working great, till it didnt….. company gives you two bolts that are used for compressing the spring. First one lasted 12 springs. Second one lasted 2. Using nothing but hand tools, no impacts, and still the bolts seized on the threads. Had to rent a tool from the local auto parts store to finish the last 2 springs on my LS3 heads

Worked perfect
This worked just fine for me. Changed out all 16 stock valve springs with high performance springs for a cam swap. Use hand tools and keep anti seize compound on the threads. No problem. Worked perfect. No brainer for the price.

Great tool for the price.
Read the directions, greased threads and it worked perfect for removing and replacing 16 ls6 valve springs. No stripped threads etc.

Quality spring compressor
Bought this to install pac1218 springs on my lq4. It did the trick. Not complicated to use hopefully be able to use it again and again.

Get what you pay for, but it worked
Get what you pay for, but it worked for my one set of heads. If i was a mechanic building ls daily, id buy a 100-300$ tool, but I dont. Came with a spare bolt, and i never had to use it fortunately. For all i know this tool could last 2 valve jobs or 10, but for 25$ (sale) i cant complain. Bolt showed wear after 1 set. The key to using this is aligning the springs before compressing. Couple times when it didnt align i had a heck of a time. But is what it it.

Quality
Tool made the process very easy and simple !

Great tool
This tool was awesome. Did exactly what it said with ease. Just make sure to lube the bolt. Would definitely buy again or recommend to others!!!!

Good value
Easy to use, made the job a whole lot easier

Ease of use
All ok

Good product, potato instructions.
Was able to complete a set of vavle springs witg no problem. I had no trouble with the hardware like some of the other reviewers. The instructions are beyond sub par, potato class. But after a little trial and error figure out the proper way.
Note that the t plate is offset treaded, so there is a top and bottom to it. Probably should be labeled and the aluminum spacer has a cutout for the head so it only goes on way. If it not flush flip it around. Also a litte oil or tread lube goes a long way and makes it easier to use. Also I never used an impact on the only a shorty racthing wreach which worked great.

Great product with good value
Works great. Not even sure why i considered paying 3 times as much for the same product elsewhere. Hardware is good quality and highly rated so no stretching of the bolt or wearing the nut out too bad. Did a 6.2ls all valve seals and nonproblems what so ever

Great
Worked well

Great buy
Great tool worked perfectly on my 799 heads

Best valve Spring swap tool for lsx engines
Awesome tool!!

Use it with anti seize copper for extended life!
Amazing product for the price thanks a lot. LS3 660 valve springs.

Makes swapping LS valve springs simple.
I was hesitant to purchase but this thing makes changing valve springs on LS heads simple! It does both the intake and exhaust at the same time. Ive used it on 3 sets now and it only gets easier each time.

Good value
Great tool for the price. I have used a single spring setup before, this is nice that you can get two springs at a time.

Instructions suck, but it works
For the price, its honestly pretty great. First time Ive ever had to take off valvesprings and this thing honestly made it stupid simple.

Everything is relatively strong, but I wouldnt dare use an impact on it.

The instructions are pretty damn bad, too. Really, dont even bother with reading them. Put the aluminum piece on to the head, put the T shaped steel piece on top of it (after you threaded the long bolt through the bottom), then put the spring compressor on top and start tightening.

For the T piece, theres a top side and a bottom side, but the instructions dont say it and neither does the piece. Youll learned which way is which when you go to put the compressor piece on and it doesnt line up to the springs properly. Just flip it and Id suggest scratching in or writing Top on the correct side.

Good buy
Easy to use and cheap enough

Worth the money
Easy to use, used it to change out a total of 32 springs and no issues, I would recommend this product. Just a little note, you can use the plate upside down, so when you compress the springs the retainers will come off with the tool. Shows in the directions how to set up the tool, so my fault for using the tool wrong.

Not the best
Difficult to line up and get the springs to compress evenly enough to clear the locks. Also, the material is too soft and begins to wear very quickly.

Pretty good tool
Worked well better than the other tool I had.

Good tool for ls heads
Had to use my own shorter bolt to run down the springs, I could have cut the standard allen buttonhead bolt down but I wanted to use my own hex head for ease of use. Works great otherwise.

Works great for taking springs off…. but
Works great for taking springs off….. a little tricky to use to installaftermarket double springs and bigger retainers …. had to use a screwdriver to center up the spring and had to use washers on top of the springs to keep them from shifting around…. it will work but its not going to be easy….. keep the bolt oiled and its fine

Buy this, you won’t regret it
I used this on a 2002 C5 Z06. The car has 48k miles and still had yellow springs. I bought the black and brown valve seals and PAC 1218 springs with ngk tr55 plugs.

Everyone in here says the hardware is junk but I took my time, added some oil to the bolt, and everything went smoothly. I looked at reviews on here for how to put everything together and for under $50, you cant beat it.

Worth the money
This tool worked absolutely awesome for the money.

Works good
Works good, Took a few minutes to get used to but it works great! Cheap and works good! A must for Sloppy mechanics tool kit. I installed a set of pac 1219s in some 706 heads

Not worth it
The tool got the job done, but it took about twice as long as it should have. Within the first 3 cylinders the compression plate was warped severly, and it had chewed threw the supplied hardware. Removing stock valves was fine but installing BTR .660s it was a nightmare trying to get the spring and valve lined up to compress them in car as it would warp, twist, spin, and not hold the retainers properly.

Ok, if I had to do it again, I would buy a name brand for ease.
Black finish fell off while sitting in my garage before I was ready to use it for the first time. The exposed metal then started to rust. I went ahead and used it anyway. After the first set of springs the compressing bolt stripped. I was able to Jerry rig another bolt on and finish the job though.

Does not work on 6.0L
Even though the description. Stated it fits a 6.0, it does not. Looks like decent quality, however completely useless and falsely advertised!

Recommend
Worked perfect for my cam swap in my 5.3 LS

Decent Tool-Good Value
The cost of this tool is much less than the name brand tools, but you also get what you pay for, if for daily use buy the good ones, for the weekend warrior this is your tool. This particular tool with the provided spacer does not align properly on a 5.3l vortec truck engine, I found that by eliminating the spacer and letting the base plate rest on valve cover boss (stud) it allowed for proper alignment, but be careful not to torque down the bolts in the rocker arm threads, just hand tightening with maybe a little adjustment after compression was all that was necessary. The install process requires a little bit of prying to keep springs centered on valve stems, use a long thin screwdriver between the spring and the compression plate for this, do not pry between the compression plate and base plate of the tool or you will bend the compression plate, at times I had to use a small pry bar to get the leverage needed. I also found that aligning and adjusting the springs at the begging of the compression process as many times as needed to keep them centered on the valve stem helped greatly, dont just throw the tool on and fully compress the spring, pay great attention to centering on the valve stem. Most likely you will still have a larger gap near top top of the spring once fully compressed, this will let you drop in 1/2 of the keeper, this is where you will need to gently pry between the spring and the compression plate to center the spring on the valve, you should be able to use your fingernail to rotate the 1/2 keeper to bottom while gently prying allowing room to install the other half of keeper at least most of the way to the lock groove if not all of the way, if it does not quite set into the groove a long punch and light to medium tap with a hammer will seat the keeper, you can also make small adjustments to the base plate bolts just dont go crazy torquing on them. After figuring these tricks out installation went easily, just requires patience. Two last things…1) Use the compressed air method, I tried TDC method and it can be done but shoving rope in the spark plug hole is not as easy some make it sound, especially on #8 cylinder 2) Apply grease to the keepers, it not only helps them stick, but helps them rotate easier when you are trying to get the 2nd half in place.

Not to bad
First time doing valve spring on an engine. Used this on a set of LS heads to install BTR valve springs. It made the process easy with no problems. Make sure to grease the Allen head to prevent heating and go slow tightening. Took about 45 minutes to get though all 16 without a single problem

Great quality material
Great tool . Used a couple different tools and this one is easier to use and more solid material to compress springs . Used on ls3 Camaro ss 1le

Great tool
Great tool and well worth buying over cheaper tools!

Works perfect
Great product and transaction thank you!

Works with some monkeying around.
Got the job done, but needs more design work. Adapter doesnt fit as good as it should on 5.3L GM.

Ls6 valve springs
Used to Install LS6 blue valve springs. If you use an impact, use good judgment.

Exactly as advertised.
I am very satisfied with this product. Very happy. Does exactly what was expected of this item.

Good bang for the buck
Works well but they could make a few improvements with the holes drilled and tapped straight. Also,a simple engraving staying which end is up could keep u from possibly damaging your cyl head and the tool. This is probably the best cheap valve spring tool you can buy.

Garbage
Absolute garbage the bottom plate bent making it impossible to compress the springs enough to actually disassemble. Not to mention the bolt used to compress actually snapped under the stress. Do not buy.

Great tool for the price
Simple tool, very effective, comes with a second stud in case the threads get stripped. Apply grease to prevent this. Works well on or off the motor. Used this on my LM7, worked flawlessly, Sloppy stage 2 installed with pac springs

Great product
Made it easy to change springs without removing the heads

Great tool for someone that isn’t going to do a ton of valve jobs
Worked great- put in new valve seats on my 317 heads. When using to reinstall make sure the part pushing down on the spring is centered over the spring

Not worth the hassle.
The threads in the block where poorly cut, After finally the center bolt threaded, it chewed the threads and I had to cut it down to useable threads. The hole was kinda off center and caused the valve springs to push out some so I had to grind down the sides. I ended up having to tac weld the center bolt into place cause the nut would get so gummed up with high temp grease and metal shavings that it would lock up. I would not recommend this to anyone that does not plan on having to modify it to work.

Worked great. Use lube. No impact.
Did exactly what I needed it to do. Saw reviews saying the bolt stripped. All I did was add lubricant to the bolts/nuts before using. Worked great. I used a ratchet and socket. Would not recommend using an impact or drill

I have to fix a brand new tool?
I havent used it yet, but the threads on the bolt hole are damaged. The bolt wont thread in. It should be an easy fix with a thread tap, but I shouldnt have to fix a new product.

very good for the money
Works as described

the 67605 Valve Spring Compressor Tool worked great for my LS spring upgrade
the 67605 Valve Spring Compressor Tool worked great for my LS spring upgrade.
pretty easy to use and a good value from what I can tell. shipped fast too.

Tool is trash
DO NOT BUY. Waste of money. Tool doesnt align right what so ever. You fight the tool more than anything. Ended up just buying an expensive one, you get what you pay for. Definitely not worth the money. Take my word for it, I read the reviews and seen some bad ones and ordered it anyway thinking it cant be that bad. Nope, I was wrong. Those reviews are the truth.

eay to use
Very easy to use once you figure out how to use it. Made my job alot easier.

Must have for LS Heads. Very easy and fast to use
This guy is a must have if youre looking to pour and Ill replace your valve springs, retainers etc. on your LS heads. For the price and the quality I couldnt complain if I wanted to. Took about 20 seconds to put it together and was able to knock out all eight cylinders in less than 30 minutes. The retainer was sturdy and never gave me any reason to believe it was going to move or break etc. a must have to add to your LS engine tool collection.

Made job so easy An much faster
Absolutely love this tool highly highly recommend

Time saver!!!
Its good an strong i had no issues with the boltz

Gets the job done
Works as described not much else to say.

Works Great
The tool comes with no instructions
but if you have a shred of common sense and study the tool it is easy to figure out.
You will see its threaded at an angle, screw the bolt / forcing screw in and hold it on the head…
The bolt head is on the bottom against the cylinder head…just sayin
so you have a threaded rod pointing up to use the nut and washer on…
Does the angle look correct? great your good to go!
if not? uhm try flipping it over and reinstall the bolt, lol

Keeping the price point in mind…It works perfectly.
A big name brand tool such as the Comp Cams tool can be as high as $150.00
For the savings i will deal with a little awkwardness …
The aluminum spacer is the only real pain , Putting the bolts through the tool ,then through the spacer then screwing it down takes a couple times to get use to it.
Again price point comes into play , if i was doing 10 cars a day maybe a fancy tool would be quicker?

OIL or LUBE the forcing screw/nut and your good to go , I was able to do my spring swap with one forcing screw/nut with no noticeable wear.
It does come with a spare so im set for many more cars in the future if needed.

Not worth it
I was really excited and looking forward to using this tool but it just didnt work like I was expecting. Great concept BUT it bottoms out too quick.

Great buy
Does what it supposed to do and the price is right. There are 2 bolts supplied, 1 spare, to put pressure on the springs that are not going to last long.

Great product was strong had no issue on 560 lift springs
This did the job works great on my 317 heads

Better than the name brand!!!
I purchased the name brand tool and it broke on the first spring. I bought this one to replace it and I completed all 16 springs on my LS3 with no problems.

Ok tool for the price
Strong enough to replace a set of valve spring on a LS6 engine, decent tool for the price.

Good tool for the price
Easy enough to figure out the assembly, just use common sense! Probably wont be the best for use every day on hundreds of springs, but for the weekend mechanic or just a one time deal you really cant get any better for the price. I would definitely recommend!

666
Works as described

Non-functional without all parts
Did not come with all parts needed to work!

Had to run a tap thru manufacturers threads
I had to run a tap through the threads on this tool to get the bolt to go thread in. Other than that it worked well.

Does its job well but the supplied bolts suck
This compressor does its job well. But the supplied hardware is garbage. After one set of springs the nut on top that compresses the springs was stripped. And to make thing worse the nut was leaving metal shavings in the head when tightening the tool down. Went and got some Grade 8 bolts and nuts to replace the supplied ones and the tool worked flawlessly.

Great tool!
Ive been working on cars and motorcycles my whole life and this tool worked flawlessly!!! Took all 16 valves out of my heads without a single problem. I read a couple of reviews on this tool and lets just say, if you cant hang a picture, you have ZERO business working on a vehicle. Some people out there give these tools a bad review because they have absolutely no idea how to use them!! This tool works GREAT!!!

Good for stock springs
Works good on stock springs not so good on double springs

Received used tool
Product states NEW, but I received a used tool(picture). At least they replaced the hardware and it will function but Im disappointed. Theres plenty of manufacturers making the same exact tools, wont be using 3mirrors any more.

Worth every penny
Worked great just add some oil on the threads and go slow.

Works great
Works much better than the individual hand grip screw down style.

Cant make it through a full set without the main bolt breaking.
Broke on the last set of valve springs when removing. You get what you pay for.

Great LS tool
Worked out great just what I needed

A must to have on your ls motors
Easy to use once you figure out what side is up

Best bang for the buck
Best bang for the buck with LS style valve spring tools. Was my first time doing a cam job and valve springs. I would buy again.

Awesome Tool
very easy to use, and only took a couple of minutes to figure out how to use it. I used this on an LS2 (L77) engine and had no issues. Well worth the money.

Works great.
Works great taking the springs out, but installing them is a pain. Also didnt come with instructions how to assemble.

Look at which way the angled bolt is going
Pretty good for what I needed I use lube in the threads to keep them from stripping make sure you look at which way the angle bolt is facing to save you some headaches but used this on a dozen heads no issues so far

Flawless
Add neverseize to the threads and you wont have an issue

Worked Great No problems
I was skeptical to but it seeing how there are some many people redesigning this type of tool. However this specific one worked great no issues. Used this tool on my ls3 engine bought that was seized up and this tool did its job no problem

Good tool for the job
This tool is very nice and worked for me just fine. I did my springs with the cylinder heads off the truck so it was alot easier to work with but if you do this in the vehicle make sure you have a magnet at the ready to catch those keepers. Also it can be a tad bit finicky getting it aligned properly but if your patient you can get it done. Overall would recommend to my buddies.

PAY MORE FOR A QUALITY SPRING TOOL
I figured I would save money when using this tool to change out my springs for a cam install in my LS3 engine.

Because of the way this tool is designed it took me almost 7 hours to change all of the springs in my engine.

On the last two sets of springs the tool started to strip and was extremely hard to use.

I highly recommend spending the extra money and buying a quality tool like the ones tell that is sold by Comp Cams.

Plate holes to narrow
The holes arent wide enough to bolt the plate onto the heads. About 1/16 th off. Little ticked off right now

It compresses springs
For removal of factory springs, works pretty good. Saves time removing 2 springs.
It was rather precarious (PNA) installing 2 springs simultaneously on Casting 317 heads, with lift rating 0.625″ and install 1.8″ height. Had to recenter several times on each pair, but thats easily done.
Keep the compression bolt lubricated, go slow, be safe. Just because it comes with 2 of those bolts doesnt mean you will need it. Its because they know nothing is idiot proof. You strip that bolt, its YOUR FAULT, and STUPID hurts sometimes. That T-Bar comes flying off, hits you in the face, its going to Hurt.
It got the job done, saved me some $$.

Nice product
Took me about one hour to swap all springs its easy to use

Works as it should .
Works perfectly fine .

Looks good
Looks good havent had a chance to use it yet. update unfortunately it is to small for the hemi head and valve spring

It works good for the cost.
Cheep and it works but can be a pain in the a$$ to line up the spring retainer to install the locks

A little weak. Not thick enough to compress completely.
Bought this for my 6.2L, 2014 Sierra Denali. Putting in different springs. After 2 cylinders, arms on the spring side bent, its only about 1/8 of an inch thick. If it was 1/4 inch thick, it would probably be a great tool. Also it doesnt go down far enough to compress the stock springs completely. And as others have said, it stripped out the threads. If you put any after market springs with more pressure, this is definitely not going to work. Sometimes inexpensive means cheap.

Much cheaper than most others but just as effective!
Does the job well. Pay attention to the direction the compression bolt is installed, put a tiny amount of high quality grease on the threads (the long bolt, not the short ones), and make sure the skirt mount bolts are no tighter than a rocker mounting bolt and youre good to go!

yup
Works great on ls1 engines

Super fast shipping and Item as described and worked well
Super fast shipping, instructions was ok, overall worked like a charm. I did grease the long bolt for ease of wrenching. I would definitely purchase again if I need to.

Good
Works great for the price

Great!
Gets the job done without costing a lot.

Good product
Worked perfect for installing my dual valve springs on my LS3 cylinder heads.

WAY worth it
Works better than a standard valve spring compressor. Dont have to worry about the spring poppin off or the tool not catching and its milled just right.

Works Great! Just follow the directions
Work great just like shown. Likes the threads just like recommended and went slow by hand. Definitely worth the money, especially if you dont use it everyday. Made the job way easier.

Does the job
This thing worked well and was quick. As others have said, the instructions arent much, but it seems pretty obvious how its used. They must be checking the reviews because mine came with “Top” already etched into the top side of the black T-shaped piece.

Also, just use wrenches, no power tools.

You get what you pay for. But it works great.
My particular one lacked all the hardware. It was missing a nut and washer. But worked great once I went and bought replacement parts for what should have came with it.

Doesnt work on this 5.3L Engine
After doing what I thought was a through investigation this item does not work on my my Chevy 350 heads. The whole design is cheesy and really kind of crappy if you ask me. 1. The main screw – there is no way to stop it from spinning. why not have a notch washer and hex head to stop if from turning? – In this design I needed the offset to allow the springs to compress . I couldnt get enough travel for this to work. Either make the compression bracket with an offset – you could flip for 1 type or the other – just about a 3/8″ Step would have worked. – I didnt have anything on hand to create the offset so yes it still doesnt work.

Grest tool. Works awesome
Works great. I would recommend this tool for your LS head spring upgrade.

MAKES SWAPPING VALVE SPRINGS EASY
INSTRUCTIONS WOULD BE NICE FIGURED IT OUT PRETTY QUICKLY AND WAS A BREEZE TO SWAP VALVE SPRINGS

Does what it says
Removed the springs with no problem

Does as it should, simply… effectively.
Does as it should, simply… effectively.

Worked great! Oil the bolt and nut on every set of valves you remove to prevent stripping.
Worked great! Oil the bolt and nut on every set of valves you remove to prevent stripping.

It work is
Works ok, not the greatest with Texas speed stuff but will work.

Great product
This is a must have to get tool for ls heads very easy to use. Had both heads done In about 45 minutes and it is with 120 psi set pressure springs

Just fine
Works well with impact ratchet, keep her oiled up nice and slick and she will be fine

works great
tool works great i had to hold the head from turning at first to break them loose then it turned with ease as shown in video. instructions seem pretty detailed some would probably like pictures for step by step but i didnt read instructions until after i watched video in the ad. time will tell how well tool is built

Wrong tool
I have a 2012 chrysler 300 and this was not for my car I this is for gm or ford

Used multiple times and still like it.
Wasnt sure at first. After I actually used it, it replaced my old one. Only for LS and if used as it is supposed to be works great.

Great quality!
Did not crap out like other cheap kits. I used it on my 2016 Chevy SS Sedan.

Make the job easy
Great tool, good thing it came with an extra bolt for the compressing part of it. I remove the first set of springs. On my second set the nut seized on the bolt ended snapping the bolt. So with the extra bolt and nut provided and I use anti seize on the bolt I was able to do remaining springs. Use anti seize!

Dont buy used.
Missing parts.

Great tool
Worked perfect to replace the valve springs on a LS3 engine.

Worked perfect for trick flow springs and retainers on a 5.3 vortec
A simple tool thats really easy to use

Awesome
Works great and easy to use but make sure you put lube on the bolt.

Cheap Quality
I used it and stripped so easy even using a socket it was stuck to the point i had to used my impact just to remove this from the heads poor tool

Get a single spring compressor
I had widen bolt hole to even use dont waste your money took longer to modify than to remove and reinstall springs would of just sent it back but started job at 10 pm

Does not work for L86 6.2 heads.
Nice tool, but does not work with GM L86 motor that is a 6.2.
Probably would work fine for the older LS motors.

Worked great
Worked perfectly

Worked on 823 LS3 heads
No problems pulling threads or damaging bolts. Easy to use. Used for removal and installing dual springs.

Junk
For starters, I had to clean the threads up in the plate to even get the bolt to start. Then found it wouldnt wouldnt fit between my valve springs, so I had to grind the tool down. Aired up the cylinder and started compressing the springs and found it wouldnt compress the springs far enough to get the keepers out of the retainers. You definitely need to find a different tool, especially for a 243 casting Gen 3 LS head.

Works
Worked great on my 5.3 ls heads. Seems well made.

So much time saved
Way better to use this than the “loaner tool” at the local parts house. Easy to use and very handy

Great
Awesome tool, works really well. Would recommend to anyone doing valve springs on a ls based engine

works, just lube
You are putting a lot of force through this, just lube the threads every other spring set and you will be fine! works Great!

Didnt last nearly as long as I wouldve liked.
The concept is fairly straight forward, and I did read a few reviews here, I dont do a whole lot of LS head work, so I wasnt too worried about them meeting the needs of a production level shop or anything… but the nut stripped out on the last pair of springs while I was disassembling a couple (2) truck heads to clean them and get ready to install stiffer springs and what not.

as far as angles and what not, if you cannot figure out how this thing bolts up to the head to use correctly, you should not be working on your own vehicle(s), Ill probably end up drilling and tapping to a larger thread and maybe tack welding that in, well see.

Much easier and faster than the stupid C-clamp style compressors you rent from the parts store, so there is that.

But in terms of longevity, this thing as delivered is maybe good for one set of heads start to finish. Maybe.

Good tool for the money, got the job done
Overal a good tool for the money, if I was going to use it often I would probably buy a better long bolt and nuts to replace supplied ones. I changed all the seals on my 2010 suburban with this tool and really cant complain as it did what it was supposed to do. I bought the comp cams valve seals and saved the box from those to store the spring compressor tool in.

Works great
Great product. Put a set of pac 1219 springs on my 243 heads. Works like a champ doing both springs as opposed to the single spring compressors.

Not as good as advertised
Would not recommend for disassembly, worked good for reassembling the new springs

Tool works great
Tool works great.

Great tool
Great tool and make quick work of the job. Its a must have!

Works great
Nice little tool
Good value
Easy to use
Saves a ton of time

I wouldnt think twice on buying it

Missing hardware and not machined correctly.
Missing hardware and not machined correctly.

Works very well
It works great

Is not compatible with 1st Gen 5.7 engines
Poor advertising lists my engine as compatible does not fit. I can drill it out and the tool will work. Why list my engine if it doesnt fit?

This will break after two springs
Cheap af bolts that will strip very quickly and might even snap had it happen wasnt using impact just a wrench trash order your self the Texas speed tool and save your self the trouble if you got the heads off just buy the clamp

Save your cash and buy this tool instead
No need to spend $90+ on a good brand of valve spring compressor, this one works great. Used it on my 02 Z06 Corvette (LS6) and it was perfect.

Efficient tool Must have!
Tool worked great! Specifically designed for LS motors and speeds up valve spring removal immensely

Makes spring and retainer removal easy!
Makes removal of springs, locks and retainers easy!

Great buy
Used this for installing my TSP cam kit with duel valve springs. Worked great with no major issues. As a professional mechanic, I can definitely say it worked as it should. Only downside i can see is this not lasting for any more than a few cam swaps, even after oiling the threads multiple times the threads on the tool were starting to wear down. Either way, good buy and got what i needed done.

Garbage
Product arrived and is used, threads were ruined

Do not buy!!!
Tool does not come with all of the hardware needed to use! Do not buy!

Worked As Advertised
Good Product for the money and made replacing the #6 exhaust valve in my LS1 a breeze.

It works, not sure on longevity.
Worked well for two sets of Gen 3 heads so far, but the stress placed on the bolt, nut & washer during compression makes me question longevity of the tool. Overall, would recommend.

INSULATED IN THE FIRST VALVE AND WITH STOCK SPRINGS
I COULD NOT REMOVE THE SECOND VALVE BECAUSE IT WAS ISOLATED WITH THE FIRST AND WITH ORIGINAL SPRINGS

Confusing to use but works well!
Did the job!

Use grease on threads!
More than adequate when used properly. Use grease on threads. It compressed my .560 lift spring with no problem whatsoever. I would say when used properly (many bad comments are from improper set up use) it should last for dozens if not several dozens of spring changes. For the price it cant be beat.