True Flat Block

[old28]

I am putting together a Model A motor that will run a 6.1 - 6.8 iron high compression head with a copper head gasket. What is the max out of flat on the block before it needs to be cut?

 

[Tom Wesenberg]

I would be OK with .003" side to side, and .006" max for end to end.
A thin steel gasket would need to be a bit less.

 

[old28]

Tom Wesenberg -- Thanks for the information, just what I was looking for.