... I called summit and ordered longer pushrods .045 and put them in (.025 for lifter preload) I'm on stamped steel stock pedestals btw. Now I have a lot of valve noise from a couple of the valves. Sounds like there is lifter/rockers. Any suggestions? Could it be that I have P/v issues? I didn't check p/v clearance. ...
Hi Mitchell. First — after installing the .045" longer pushrods, did you actually measure .025" preload on all
rocker/lifter sets? Just so I know which method you're using; how did you measure the preload?
Next, have you repeated the preload test? Is it different? Is it just noisy, or have you done a leak-down or compression test to verify if there is any valve damage?
Although we can do some analysis on where the noise is sourcing, and what to do about it; you really should do a P2V (piston-to-valve) clearance check. This can be done by simply swapping the valve springs on one cylinder for light 'test' springs from your local hardware store. A pair of springs that have about 10 to 20 pounds of force at about 1-3/4" will be fine.
Install the test springs on both valves of one cylinder that is not noisy, but preferably cylinder #1. Starting at 90°BTC of that cylinder, rotate in standard direction 10°, and STOP. Press each valve in slightly (about 1/10 inch) to feel for contact. If no valve contact on either valve, turn the crank 10° more, STOP, and check again.
Repeat this process all the way to 90°ATC. Turn the crank 180° to 90°BTC again, and repeat the test (for the other two strokes of the four-stroke cycle). At no time should the clearance be less than .080" on the exhaust, and .050" on the intake valve. Preferably, you should not find any point with less than .100" clearance, else further testing is recommended.
Please post answers to the questions above, and good luck to you!