Pushrod length help

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Sep 13, 2014 | 03:46 PM

white SS 74

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Pushrod length help

What affect does pushrod length play on performance I.e to short vs too long and what is the acceptable pre load?

Thanks

Sep 13, 2014 | 05:11 PM

Gotit4cheap16

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I too would like to know this

Sep 13, 2014 | 10:36 PM

G8One2

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From: Detroit, MI

I think pre-load is specific to the lifter your using. You would have to get that information from the lifter manufacturer, for the specified pre-load of the lifters your using. As far as push rod length, too long, and your valvetrain geometry will be off possibly causing broken rockers, improper preload on your lifters, stuck open valves when the lifters are pumped and other issues. Would be best to search the forums on proper pushrod length measuring.

Sep 13, 2014 | 11:18 PM

Burken01

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Quote:

Originally Posted by white SS 74

What affect does pushrod length play on performance I.e to short vs too long and what is the acceptable pre load?

Thanks

Too short and you'll have very little preload on the lifter and during high RPM it'll cause the valve train to crash and beat itself up and wipe out the cam.

too long and you'll bottom out the lifter plunger and possibly hold a valve open when its not supposed to be..

find the preload range for the lifter you have and buy a push rod length checker and measure for yourself and you'll be good to go, these are hydraulic lifters and need to be set up right so they do the job they were designed to do..!