Hello Russ,
I just talked to crower cams tech people on cold adjustment, as long as you have an iron block and heads parts should grow together, then the clearances are the same cold. mine being intake @ .026" & exhaust @.028", it seams to be more clearance the bigger the lift as mine is a solid roller with .632" & .637". Glad you brought this up as I am in the middle of building a new engine for mine and am at the point of sizing the push rods and was going to need to check on this.
Mark
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