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Availability:
In Stock.
Arrives
Wednesday, Apr 29
Features
- Country of origin : Taiwan.Material:Steel
- Package Dimensions : 19.82" L x 13.05" W x 1.93" H
- Package weight : 2.8 pounds
- Model number : 66784
- 1-inch Stud Length
Description
Stud Mount Valve Spring CompressorFor 3/8" & 7/16" Rocker StudsWorks on Assembled Engine Removes Valve Spring From Assembled Engine
Brand: ProForm
Voltage: 5 Volts
Power Source: Corded Electric
Noise Level: 50 Decibels
Special Feature: AC & DC Adaptable
Voltage: 5 Volts
Power Source: Corded Electric
Noise: 50 Decibels
Additional Features: AC & DC Adaptable
Maximum Power: 2 Watts
Motor Horsepower: 2 watts
Item Weight: 3.2 Pounds
Item Dimensions L x W x H: 19.82"L x 13.05"W x 1.93"H
Style: Portable
Material Type: Alloy Steel
Brand Name: ProForm
Included Components: Per Item Description
Model Number: 66784
Model Name: JEGS
Manufacturer: Proform
UPC: 037995667840
Global Trade Identification Number: 40
Manufacturer Warranty Description: 30 Days
Frequently asked questions
If you place your order now, the estimated arrival date for this product is:
Wednesday, Apr 29
Yes, absolutely! You may return this product for a full refund within 30 days of receiving it.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
To initiate a return, please visit our Returns Center.
View our full returns policy here.
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Top Amazon Reviews
I am working on AFR heads for a Chevy Small block, old style GEN 1 block 1970 vintage. The AFR heads I have use a stiff dual valve spring set up. I have 2 valve spring compressors in my garage already. The small one that screws down while grabbing the valve spring coils has worked on every LS engine I work on. I also have the old style large valve spring compressor that reaches around and holds the valve closed while compression the spring. These Stiff AFR springs just laughed at my old compressor tools. They would not even start to compress so I could remove the keepers. This new Tool from Proform screws onto the stud and very easily allows removal of the valve spring. Almost no effort at all even on these strong springs. A little awkward to screw the device onto the stud but that only takes a minute and you are ready to remove the Valve spring. I did this on an engine stand with the heads mounted on the engine. I think it would work equally well even inside the car. I don't normally write reviews but this tool does its job well.
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Reviewed in the United States on August 2, 2022 by Mark McDonald
Amazing tool, works fantastic. What i appreciate the most is you can actually turn the tool almost 90 degrees to the valve and it will still work! This is great for tight areas (i.e. by brake booster or firewall). If you are replacing valve springs, get this tool, it's a must have.
Reviewed in the United States on August 24, 2024 by stratdude83
I'm glad I got this tool cuz it just compressed those 140 lbs springs NP :D :D :D I've got the pry bar, the over head clamp thing, and they are useless with 140 lbs valve springs. The pry bar would work but it mars the seats and pushes down at an angle which is not ideal and if you are not centered, you could bend a valve. This tool takes all the guess work out of it and it does it proper by sending the valve straight down linearly vs. a swing motion you get with a fulcrum. Given the precision with my AFR 165cc 1402 heads and the price, I must do precision as well. I have a new cam and engine and it's all EFI so I really need it in the truck to test it. I also need it in the truck to break the cam in which requires me swapping springs. I'd rather not replace the head gasket after my 30 minute cam break in so I just want to pull/replace the springs while everything is in the truck i.e. just pull the valve covers. The only tool I got that could compress the 140 lbs springs was the C-Clamp style which worked great but the heads have to be off. There is so much stuff I have to remove to do that including all the intake. No bueno. With this tool, I can do exactly what I want and replace the valve springs with just removing the valve covers and intake plenum. And some EFI stuff but that's doable, not pulling the entire top half of the engine which is again, no bueno. I'm glad I got this tool cuz it just compressed those 140 lbs springs NP :D :D :D
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Reviewed in the United States on August 12, 2021 by application error
This spring compressor is better than the hand crank version for sure but, if you have the heads off it can be a bit of a struggle when using with high performance springs, it tends to push the valve open instead of allowing the retainer to move down on the valve even if you have something under the valve to hold it shut. What this means is if you get them off say for like installing checker springs, when you go back with the performance springs it is difficult to get both keepers in due to the fact it opens the valve instead of pushing the retainer/spring down. I routinely would get one keeper in then had a hard time getting it back out to try to get both in again. A little wheel bearing grease to hold the keepers on was what worked for me.
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Reviewed in the United States on October 29, 2024 by D man
Wow. Don't do valves seals and springs on your car without it! Took a little playing with to get my method down, but what a great tool. A few tips: 1. The center shaft has two ends threaded differently for the two supported rocker stud sizes 2. The tool disassembles easily for doing the valves near the firewall. One valve I had to install the center shaft and then the tool around it. 3. It works best if you use the lock nut above the foot to lock the foot to the tool (keeps it from wandering) 4. At the bottom of its travel the tool locks and holds the spring compressed. Use the threaded foot to get it just right. 5. Go slow at first and within a few valves you'll have it down and move right along. 6. If you are doing valves that have never been done, use a stuck bolt breaker fluid (like PB Blaster) on the retainers three or four times a few hours beforehand. If you are doing this one the car, use the rope method. Air won't hold the valve hard enough to break the years of oil stick around the retainer. Lastly, using the rope method, after you've soaked the retainer areas, using a large deep socket (I used a 19mm), rap the retainer hard several times with a hammer to break the stuck retainer and keepers free so the tool can work easily. A bit of muscle may still be required to free the keepers.
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Reviewed in the United States on September 5, 2017 by All Outta Bubble Gum
For a stock 350 you have to bend the arms till they are straight. Otherwise you put side pressure on the spring which makes getting the keepers in difficult. Theyre all angled up when it's new in box but you should bend them down to be straight. Other than that it worked great.
Reviewed in the United States on July 19, 2022 by RyRy
Works perfectly! Makes compressing the springs very easy!
Reviewed in the United States on March 19, 2026 by rpeters
If you are doing a 4.3 V6 engine this is the compressor for you. You can get to all the rocker studs, even at the back of the engine. You will need to semi dismantle the tool to do it, but it is possible. It is so tight, that a regular compressor won't work.
Reviewed in the United States on March 9, 2025 by Love Me Do