Small Block & Big Block Chevy Specific - 7.4l 454

Hey gents... I have a 7.4L 454 Mercruiser in my 22' Scarab. It doesnt perform the way that I think to should... what is a good cam, somewhat mild but good hp gains?

What are other upgrades? I know very little about BBC....

Thanks gents!!!

Call up Comp Cams as they might be able to give you a good idea for the marine
application. It might also help if you list the specs on the motor - what heads, intake, compression ratio, final drive ratio of the outboard, etc.

Hmmmm Ok Well its all stock.

1996 Mercruiser 7.4L with a B1 outdrive.

It is not a salt water boat, fresh water only.

If it will help I will go and look up the stock specs....

Thanks!

Sure stock specs. will help but I don't think you'll find many people knowing how to mod a marine engine. That is an entirely different world all in itself. I've done a few big blocks on friends boats and the setup is very different.

What is the primary purpose of the boat going to be?

Well its a Scarab.... It's only purpose is to go fast :) My f-body for the water. I didnt realize that the Marine engines were that different.

Hahhaa....right, I hear that. Well, it's not that the marine engines are different, they are used for a diff. purpose vs. a car. However, similar to how you may set up a car for drag racing, circle track, IMSA road course or or a high speed cannonball run...you should do the same for a boat motor. It needs to be setup and it's the "combination" that works.

As stated, I would call Comp Cams and possibly any local performance boat shops in the area. I can make a few calls to friends with boats but it will probably take me longer to get you an answer.