bent pushrods
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New User
Joined: Jul 2004
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bent pushrods
i have a 77 f150 351m,less than 100mi on motor,redone entire motor having problems bending pushrods. heads were redone also,resurfaced,valve job w 4 xhaust valves replaced. is there a clearanse spec. between the rocker & valve? allready bought shims for fulcrums,can't adjust properly,every shop is a chevy shop here ,any ideas?
Lead Driver
Joined: Nov 2000
Posts: 6,648
Likes: 352
From: Albuquerque
You should check your lifter preload for all the valves. Crane has the proceedure on their web site. Some time the machine work can eat up all the clearances in the valve train. Also, are you sure the push rods are seated in the lifter? If you get them on the edge it's a problem.
Also if you do have too tight clearances in the valve train you will start burning valves in short order if not corrected.
Good luck!
Also if you do have too tight clearances in the valve train you will start burning valves in short order if not corrected.
Good luck!
