Is the rocker arm on a Pontiac too tight?
After two decades of hands-on with various Pontiac V8 engines, we find that insufficient attention is given to rocker arm adjustment. Proper engine operation and optimal performance will not be reached if your rocker arm adjustment is to tight or too loose, apart from other aspects.
How to adjust intake valves on a Pontiac?
Rotate crankshaft 180 degrees clockwise and adjust intake valve on #1 and #8; exhaust valves #3 and #6. Rotate crankshaft 180 degrees again (TDC) and adjust intake valves #3 and #4; exhaust valves #5 and #7. Rotate crankshaft again 180 degrees and adjust intake valves #5 and #6; exhaust valves #1 and #2.
What kind of valve lift does a Pontiac 068 have?
The high-performance Pontiac cams hobbyists are most familiar with are the 068 and 041 grinds developed during the 1960s. The 068 was developed for high performance street use and contains 212/225 degrees of .050-inch duration and just over .400-inch valve lift.
How to set valve lash Wallace Drag Racing Pontiac?
Use 7/16 studs with polylocks (locking nuts with a setscrew),turn down adjuster nut slowly while spinning pushrod back and forth with other hand until all play is removed WITHOUT pushing lifter cup down into body.You should JUST feel the pushrod get hard to spin.Then turn an additional 1/2-1 full turn and lock it.
After two decades of hands-on with various Pontiac V8 engines, we find that insufficient attention is given to rocker arm adjustment. Proper engine operation and optimal performance will not be reached if your rocker arm adjustment is to tight or too loose, apart from other aspects.
Can a rocker arm adjustment be too loose?
Proper engine operation and optimal performance will not be reached if your rocker arm adjustment is to tight or too loose, apart from other aspects.
What’s the torque of a GM rocker arm?
First thing is there are 2 different bolt sizes, 8MM (usually on passenger cars) and 10MM (usually on trucks and SUV’s). The 8MM torque is specification: 89 in/lbs plus 30 degrees. The 10MM specification is 24 ft/lbs.
How to repair GM rocker arm thread damage?
The only “trick” to using this method is to run the counter bore tool deep enough so the shoulder of the insert will be just below the slot for the rocker stand as it is in the previous repair. Now for the instructions: I’m going to cheat; here is a link Time-Sert ‘s website.
How do you thread a GM rocker arm?
To be sure to get the right depth, put a piece of tape on the drill at 7/8” from the tip as shown below. Tap and thread the hole using a tapping lubricant or equivalent. Clean the threaded hole with Brake Kleen or equivalent. The EL-41 insert has some kind of thread lock compound on it from the factory.
What to do about pushrod rocker arms on GM 3400?
If they are the rocker arm studs may have pulled the threads out of the cylinder head. If that happened you would need to drill tap and using Helli-Coil to repair. I just completed this job, and after assembly car worked and ran fine. Made a test drive of 3-5 miles, Axel from stop as well as while moving.
Can you adjust the rocker arms on a Chevy small block?
Answer: There is no special valve adjustments on this motor as was the case with the older Chevy small block. Rocker arms are just torqued to specs. The most important thing is that the push rods are installed correctly. They are different lengths.
How much does a GM rocker arm repair cost?
The first repair is using a Time-Sert kit part# 1812 with part# 18129 insert. The reason we like the Time-Sert repair is the method used to lock the insert in place (we’ve never had a failure). The bad news, the kit is around $70 (as of this writing).