Shiming up Rocker arms
#1
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Shiming up Rocker arms
I'm was checking pushrod lenght last night and with the pushrods I have (7.40), the lifter preload was .080 on the intake and .100 on exhaust. Is it ok to shim up to the rocker stands on stock rockers to achieve to desired .050 - .075 preload?
#2
FormerVendor
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You'd be better off exchanging the pushrods for the correct length. If you are confident on your measurements, I would get a 7.375" and be done with it. It's easier to get the correct ones than trying to shim them and make sure the swipe on the valve tip is still good IMO.
Jon
Jon
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Exchanging them would be nice if I had the receipt. Not an option in this case. I'll check the wipe pattern with a .025 shim and make a decision on what to do.
#5
TECH Senior Member
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I would check the wipe with no shim first and then with a shim. However, from speaking with a few builders they have stated that aftermarket cams and stock rockers typically require a reduction in height to aid with proper geometry. I also think your preload is fine as is since every stock engine I have checked has come near 0.100" of preload.
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#12
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Thanks for all the info. Checked PTVC last night and no problem there. Over .300 clearance on both. I'll wait until I torque the heads down with the new gaskets and check the pushrod length again just to make sure.