I have two 454's that are street motors that im going to convert to marine. What all needs to be done to do this? and do I need marine oil pans?

The main things to do are...

1. use brass freeze plugs
2. use a marine cam...not a car cam
3. Get stainless valves and inconell for the exhaust

I have 2 oil pans...gen 5 and 8 quarts. Car pans are usually 6 quarts.

get rid of the dished pistons if it has them too. all pass car-truck engines are designed with emissions as first priority, and CAFE (corporate average fuel economy) second. only then do they worry about whether it makes any power. sadly, boats are starting to go the same way...

+100...good call. Sorry, I forgot about those dish pistons but you are totally correct.

Thanks for your help guys. More questions sure to come on this project.

Also remember that car engines can't typically run 4200-5200 rpm's all day. Like a marine engine can. Also I'm looking for a 454Gen VI oil pan with a one piece rear main seal if anyone has one laying around.