um not the best with them but the bore and stroke . ther both the same basic block just a few parts changed . maybe pm the restore kid he knows more on them :shrug:
Had the same question/problem. External is same. All the internals less the valves seem to be different. Best bet if you wanna use a 4hp block and upgrade is getting it bored for the 5 hp piston. TRK chimed in on my old thread "4hp Kool Bore" Some info to comb through if ya already haven't.
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