Push rod length?
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Senior User
Joined: Sep 2004
Posts: 196
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From: pennsylvania
Push rod length?
Can anyone tell me where I can get tried and true info on calculating my pushrod length? I have a set of GT-40 heads that were decked, 1.7:1 roller rockers ( ford motor sport) and roller cam. Call me paranoid, but I need more than a just slap it in aproach. I've looked in several engine building books as well as some web sites and can't find anything that sounds concrete. PLEASE HELP!!!
Senior User
Joined: Nov 2004
Posts: 294
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From: Kentucky
Go to Compcams web page and they have a pretty good instruction page.
They also have adjustable checkers that you can buy from them and mail them back so they can send you the right length.
deerhunter3814
They also have adjustable checkers that you can buy from them and mail them back so they can send you the right length.
deerhunter3814
Senior User
Joined: Jun 2005
Posts: 103
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From: Manitoba Canada
Crane cams DOES recomend longer pushrods for 1.7:1 ratio rocker arms. (the ones made by crane for FMS) Part number is 36625-16. these are ALMOST 1/8 of an inch longer!! 0.117" to be precise. So, if your running these rockers, you will need longer pushrods. Even FMS recomends them...little known fact.
Senior User
Joined: Jun 2005
Posts: 103
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From: Manitoba Canada
The number I gave, was the specified number to be used with those rocker arms on a roller lifter engine (factory roller).
Last edited by F150 hybred; May 19, 2006 at 08:09 PM. Reason: addition
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From: Cincinnati
Originally Posted by F150 hybred
The number I gave, was the specified number to be used with those rocker arms on a roller lifter engine (factory roller).
Mike
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