Lifter preload

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Dartfreak75

Dartfreak75

Restore it, Dont part it!
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How do you measure lifter preload with non adjustable rockers? I have done some research but everything I see is for adjustable Chevy rockers. I dont think I will have an issue I have standard length pushrods with factory rockers, I only took .03 off my heads but I'm using a thicker than factory 8335 headgasket so that should even out. But I do want to measure it and be safe rather than sorry! The only way I can even think to do this is to use an adjustable pushrod and set it to where it's right up against the rocker then measure it vs my factory length pushrods and subtract the difference to get the preload. Does this sound correct? Am I on the right track? Lol thanks guys
 
The way you describe will work fine. If you've got an adjustable pushrod and 12" vernier caliper, you're good to go. If you really wanna get crazy, check all 4 corners.
 
Awesome will do! I think it will be fine I least hope so because iv already bought new pushing lol but I want to check it to make sure. Crazy enough iv never heard of lifter preload until the other day. I have 3 engine building books and cant find anything about it in none of them. It just says to verify pushrod length but doesn't say how.
 
Sounds like you're doing it right. Once you start replacing factory cams with aftermarket ones that may have smaller/larger base circles, and replacing lifters with non-factory replacements, factory pushrod length may not work, even with factory rockers. Checking pushrod length is the only way to know for sure. Let us know what you find.

btw- when you buy lifters, ask them what their recommend preload range is. They'll likely say, whatever the factory range is, but it's good to make sure.
 
mopowers said:
Sounds like you're doing it right. Once you start replacing factory cams with aftermarket ones that may have smaller/larger base circles, and replacing lifters with non-factory replacements, factory pushrod length may not work, even with factory rockers. Checking pushrod length is the only way to know for sure. Let us know what you find.

btw- when you buy lifters, ask them what their recommend preload range is. They'll likely say, whatever the factory range is, but it's good to make sure.
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If I remember correctly the lunati pamphlet that came with my cam says .02-.06 I will look to make sure when I install everything. I havent gotten the block back yet I'm just trying to get all my ducks in a row before hand. I like to prep! This is my first real build and I dont want any surprises so I'm trying to read up and learn as much as I can and be prepared and know what all to do before hand.
 
mopowers said:
The way you describe will work fine. If you've got an adjustable pushrod and 12" vernier caliper, you're good to go. If you really wanna get crazy, check all 4 corners.
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Actually, if you really want to go crazy do all 16.... they can all vary a bit, 'specially all the stamped rockers. But probably overkill here LOL
 
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