Valve Lash, Solid Lifters, Iron Block, Aluminum Heads

[67 Nova Boy]

This is from an engine builder and his thoughts on this matter...

It is impossible to know the exact cold adjustment UNLESS you have set them hot and then check them cold for future reference. As an aside, the reason hot is used is that different parts expand differently which would require a chart for each valve when cold. Not worth it in my opinion. Always check hot...

Dave
67 Nova Boy

[napa68]

Originally Posted by 67 Nova Boy

This is from an engine builder and his thoughts on this matter...

It is impossible to know the exact cold adjustment UNLESS you have set them hot and then check them cold for future reference. As an aside, the reason hot is used is that different parts expand differently which would require a chart for each valve when cold. Not worth it in my opinion. Always check hot...

Dave
67 Nova Boy

X2^^^^^

[Woj]

Thanks for the reply. Darrell found a sheet with tech tips from Crane Cams that says the correction is to subtract .006 from the stock warm adjustment. But, these should still be checked hot for absolute correctness.

Here's the tech tip for cold engine rocker adjustment:

Iron Block Iron Heads Add .002"
Iron Block Aluminum Heads Subtract .006"
Aluminum Block Aluminum Heads Subtract .012"