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As it was mentioned earlier, those industrial headed MH 413's have a very heavy 4 ring piston. And they have LY rods. I had a 1972 413MH engine with industrial heads and it had those crappy pistons. Looks like some higher than normal motorhome RPM could break those LY rods with those heavy pistons, and I mean they are heavy and very low compression.




FOUR RING piston ? .... I have heard of them ... but never seen them .... them being CRAPPY ? ... for HP use ... ferr-sure ... but for what that engine was built for ...nothing better !

The heads ? .... again ... they are PURRfect for their intended use ...LOUSY for HP ... but nothing is BESTer for a lower-RPM torque motor.