Hot Rod Forum : Hotrodders Bulletin Board - View Single Post - Hydraulic valve adjustment
View Single Post
  #5 (permalink)  
Old 06-13-2012, 05:36 PM
cobalt327's Avatar
cobalt327 cobalt327 is offline
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 595 Times in 545 Posts
Quote:
Originally Posted by spinn
Thanks.

A full turn after the ticking stops . Really? What would be the reason. Depending on the rocker stud thread I would think that would lift the valve and give you problems.
The basic idea is to set the lifter plunger to the center of its travel. That gives the most leeway for temperature expansion/contraction. The old manuals for a SBC said anywhere from 1 to 1-1/2 or more turns after zero lash, but this has largely been replaced by using 1/2 to 1 turn total. For instance, Comp Cams recommends 1/2 turn for regular SBC lifters. The amount of turns needed to set the plunger in the middle of its travel will vary from engine to engine, because of differences in the thread pitch, rocker ratio, and lifter design.

What you have done is in essence zero lashed the valves. Not usually a problem, but there may be a bit of noise from the lifters if there is any lash when the engine is cold. If there is at least some preload, there should not be any unnecessary noise.
Reply With Quote