I picked up a 454 from a Baja I/O to put in one of the jet boats. It has stock chevy 3999295 pistons on simple rods with a forged crank and a 4 bolt main. The heads have crane roller rockers, guides and the large push rods. But they are 990 heads. I think the block is zero decked but I need to bring my depth Mic home to be sure. It should have 9:1 before decking. But will these heads work on a jet that won't see above 5000 RPM?
Option 2 is a set of 3872702 closed chamber ovals off a Hardin marine 454. This should put it up around 10.7 before decking.
The pistons are closed chamber pistons from a 71 LS6 (per the web) with a very small dome. I have the cam, lifters and intake from the Hardin Marine engine as well. While near the limit for pump has would the ovals be a better choice and save the 990s for a v drive engine build later? Thoughts would be appreciated.