Buyer beware...

for a used motor, its not exactly horrible. its more than a 10% difference, but still not bad. but what i have a question about is, is this a bone stock motor? if not, id have to say the cam is way to big and bleeding off cylinder pressure. you really want to be in that 140-160 range if all is correct (cam, compression, valve timming).

just an example for you, my friend bought a 440 from a guy that said he rebuilt it but never got it to run right. well, yep, sure enough, it showed all sorts of signs of a rebuild upon teardown. bad parts were, with 7.5 to 1 compression, and a [email protected] duration cam, this thing was a pig as it maintained no cylinder pressure.

you have to match all parts for optimum operation. i would tear it apart, see whats in it and measure everything, and at the very least, as mentioned, do a re-ring/bearing job on it.

--chad