Anyone running a 438 stroker kit in there 383? using there aluminum heads as well. My question is what length push rod are you using? comp cam .491 lift

I've assemble several different 400 stroker motors with those heads with 1.5 rocker ratio aluminum rocker arms and 3/8 pushrods with solid roller cams and lifters
I'm getting ready to finish assembling a 1972 413 truck block bored to 4.250 with a 4.150 stroke crank with a set of their heads and a set of ductile iron RAS blueprinted 1.5 ratio rockers, if I run into problems with 3/8 Manton 3/8 pushrods on the hydraulic lifters used in this motor I'll add onto this post later about that

The bottom line is, you will need an adjustable pushrod to come up with the correct length. Lift is not important, is the cam a hydraulic flat tappet, a solid F/T, are you running adjustable rockers or the stock stamped? Any way, to do it right, it needs to be measured after assembly.

definitely view the "straub" youtube vid on rocker arm geometry