Quote:
Originally Posted by Thumper
I was thinking that the rods are long, and since temperature causes a % deformation, any given % change of a long rod is absent from the OHC design. Both have rockers, no difference really there. Maybe the OHC design has less heat deformation (expansion), can be adjusted closer tolerance (0.002" Henner's recommendation on the 172FMM)
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The pushrods in the CG engine are aluminum so their expansion is almost identical to the rate of the cylinder. That is actually the reason the CG engines can run rather small valve gaps for a pushrod engine and are almost identical to the OHC engines. I run the same .002" on my CG lol.