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Master Fabricator
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1,780 Posts
Discussion Starter #1
Ok, I already did the search and read many posts but did not find this...

My cam has a gross lift of .748. I have a hot lash of .028 for I and .030 for E. When I am setting the pushrod length do I want to be sure I have the gross .748 lift, or subtract the lash from the gross lift?

Also, how many thousands difference would you recommend for setting the the lash cold?

Thanks!
 

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1,365 Posts
You have to incorporate all aspects of how it will run when figureing pushrod length. Inclduing lash. You can set them cold. Some types of engines grow more than others, but basic stuff can see about .004", so set them .004" tighter when cold. And then recheck after it sees heat.
 

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out of work hair dresser
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8,341 Posts
Proper pushrod length provides the correct valve train geometry. With an iron block/aluminum head combination there won't be enough variation between hot and cold to justify a difference.
 
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