edit: its an Olds 215, 10.25 compression and 185 hosspowa' ok, I finally got the motor home and it has some weird numbers on it, ill show picts. This has an aluminum air gap style factory 4 barrel manifold and factory tube style exhaust manifolds, so I am guessing this is the 10.5 compression 185 hp version? ok, here are the pictures and numbers on the heads and block. the intake number is 588239 the head number is S283274G and the block has a flat pad by the front where the head bolts that has JN537 stamped in it. There is a picture provided of the side of the block with its numbers also, note the lower set of numbers appear to have been done by an aluminum mig , anybody have an idea what it is or means? Last but not least, what do you know about these small engines? I also have the matching auto trans with it.