Valve Adjustment Question
Race Director
Joined: Mar 2006
Posts: 14,112
Likes: 28
From: Florida
EdIf it came with non bottled necked studs then you adjusted them like a chevy. A lot of HI PO engines in all lines were adjustable.
Racer
Joined: Jul 2009
Posts: 336
Likes: 1
From: Asheville N.C.
Intermediate
Joined: Apr 2011
Posts: 26
Likes: 0
Just a quick question for you guys - I read in the Chilton Repair Manual that you tighten the rocker a 3/4 turn after finding 0 lash, supposedly to "center" the valve. Most of those commenting on this post have mentioned a 1/2 turn.
Comments? I just put new lifters and pushrods in my '74 last week (haven't put the intake or valve covers on yet). So, should I go back and loosen them a 1/4 turn, or will they be ok as is?
Thanks,
The Jester
Comments? I just put new lifters and pushrods in my '74 last week (haven't put the intake or valve covers on yet). So, should I go back and loosen them a 1/4 turn, or will they be ok as is?
Thanks,
The Jester
Burning Brakes
Joined: Feb 2011
Posts: 849
Likes: 0
From: Woodland California
We use to adjust lifters less than suggested by the manufacture.
Yhe theroy back then it that valves were less likely to float.
Not sure of the science behind that but that is how we did it in 1969.
Ralph
Yhe theroy back then it that valves were less likely to float.
Not sure of the science behind that but that is how we did it in 1969.
Ralph
Drifting
Joined: Aug 2005
Posts: 1,682
Likes: 3
From: League City TX
Just a quick question for you guys - I read in the Chilton Repair Manual that you tighten the rocker a 3/4 turn after finding 0 lash, supposedly to "center" the valve. Most of those commenting on this post have mentioned a 1/2 turn.
Comments? I just put new lifters and pushrods in my '74 last week (haven't put the intake or valve covers on yet). So, should I go back and loosen them a 1/4 turn, or will they be ok as is?
Thanks,
The Jester
Comments? I just put new lifters and pushrods in my '74 last week (haven't put the intake or valve covers on yet). So, should I go back and loosen them a 1/4 turn, or will they be ok as is?
Thanks,
The Jester
Whether you use 1/4, 1/2, or 3/4 turn the operation will be the same.
The only time that more preload can be a problem is when you get into valve float situations. Then the lifter takes up the slack in the valve train and the valves will no longer seat until the lifter has time to bleed down a bit.
Thread Starter
Racer
Joined: Jun 2009
Posts: 409
Likes: 3
From: St. James, NC
Thanks everyone for the helpful information. I finished adjusting the valves on Friday and had the Vette out a couple of times over the weekend…no bent pushrods so I guess I didn’t mess anything up.
Thanks again
Pat
Thanks again
Pat
