Has anyone heard of a "Yamaha marine high performance" 305? I saw one for sale and seller said it made for sustained high rpm usage. I know its still only a 305 but I was wondering if it is likely to have any special bits in it

WAG a yamaha 305 my be 305 CCs and not cubic inches like a SBC

And/or be a 2-stroke motor.

Yea its a 305cc engine not 305L. Its an engine for a jet ski, boat and they had another version in a motor cycle 305 cross country. I road one before nice bike engine but it wont pull a car

Here's a pic of the land version.

I have seen a pic and I'm sure its a small block chevy, a roller block, seller says

"1988 short block chevy this is a yamaha marine high performance engine (240Hp) crank and rods and pistons made specialy for sustained high revs"