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For 3/8 and 7/16 Thread Rocker Arm Studs Valve Spring Compressor
- Type: Valve Spring Compressor
- Usage: Compressing valve springs with the cylinder head-on
- Material: Steel & Rubber
- Finish: Zinc Plated
- Operation: Stud-Mount Lever
- Maximum Spring Pressure: 400 lbs
- Notes: 12" Handle bar length totall.
- Replace part number: 66784
Bob
Reviewed in the United States on February 23, 2024
After making a slight modification to the angle of the feet (had to flatten the angle to make it push the spring strait and not sideload against the valve stem), the tool worked as advertised! Made short work of changing the valve springs on my heads.
Liz
Reviewed in the United States on November 21, 2024
The angle of the spring fork did not line up with valve springs. It put a large side load on the springs.
Jason Gross
Reviewed in the United States on October 21, 2024
Used on gen 1 small block chevy. Had both threads for 7/16 and 3/16 studs. Had to turn the two pivot bolts around so that it would cam over to lock. A ball drive Allen works good for that. I also took the foot off and took a little bit of the bend out of the toes so that it would push flat on the retainers. I originally bought one of those compressors that have the two legs that grab onto the spring and then you turn the knob on top to compress the spring and it was a total and complete waste of money. World recommend!
Brad J
Reviewed in the United States on April 24, 2023
Make sure you know what size studs you have in your head or have a selection of bolts that you can cut off and weld together. I found the tool to be too cumbersome to use in a tight engine bay, however it would probably be perfect for use with the heads off and sitting on an open table or bench. I tried to use this to change the valve seals on my 96 camaro with the 3.8l v6. The engine sits too far back into the firewall(under the dashboard basically).
cave
Reviewed in the United States on August 27, 2022
This worked as well as my high dollar tool.
Andrew Donnelly
Reviewed in the United States on August 22, 2022
I used this to change the valve seals on a 1988 GM 305 engine. It worked perfectly compressing the spring to remove and install.
Jason Booker
Reviewed in the United States on May 30, 2022
I have disassemble two sets of heads so far....works great...
Ryan S. Kelley
Reviewed in the United States on April 5, 2022
What else can I say? I did all the valve seals on a roots supercharged small block while it was still in the car. I had a little trouble installing the c clip on the retaining pin when I flipped the stud mount, but I replaced it with a tight fit o ring. This thing is the dogs bollocks when you’re in a tight spot, like back near the brake booster. Just pull the c lip and pin, spin the stud mount on, then assemble the compressor on top. I didn’t get it to “lock” in the compressed position, but I didn’t really want to try. All in all, a very sturdy tool that looks like it could handle any sized spring you could throw at it in a GM
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