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Thread: Valve Lash
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09-11-2006 #1New to Pro-Touring
- Join Date
- Oct 2005
- Location
- Davis/Lake Arrowhead Ca
- Posts
- 23
Valve Lash
i have misplaced my cam spec card for my comp cams 286H for my small block chevy (pn 12-36-4) i need to set the lash on no. because i had to replace the guide. The comp cams tech guy i talked to said that it should be between .040 and .060 which, needless to say is a lot of freaken clearance (not to mention a pretty wide difference between the two). He said i needed this much lash because i am using a stamped steel 1:5 rocker arm..... but i find this very doubtful as most lash specs fall in between .012 and .035. I dont mean to doubt someone who should know much more about the subject than i do.... but i cant help but feeling that this is not correct. Is there anywhere online or anyone who knows what the proper valve lash is for this cam?
67 Camaro SS/RS 350
G-machine build
there are three ways of doing things, the right way, the wrong way, and my way.......which is basically the wrong way, only its faster
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09-12-2006 #2I looked that cam up in my catalog and it's a hydraulic cam. All you need to do is turn down the adjuster nut slowly while spinning the pushrod back and forth with the other hand until all play is removed without pushing lifter cup down into body. You should just feel the pushrod get hard to spin. Then turn an additional 1/2 to 1 full turn and lock it. 1/2 a turn should be plenty. This is with poly locks. If you just have the lock nuts just tighten the nuts a 1/2 turn extra.
09-12-2006 #3New to Pro-Touring- Join Date
- Oct 2005
- Location
- Davis/Lake Arrowhead Ca
- Posts
- 23
ah, i saw that in the catalog but i thought that was initial tightening.Thank you for the clarification.
67 Camaro SS/RS 350
G-machine build
there are three ways of doing things, the right way, the wrong way, and my way.......which is basically the wrong way, only its faster
09-12-2006 #4