Small Block & Big Block Chevy Specific - 7.4l 454
09-11-2005, 07:38 AM
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....
09-11-2005, 09:49 AM
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.
09-13-2005, 06:46 PM
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....
09-13-2005, 10:38 PM
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?
09-14-2005, 12:11 AM
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.
09-14-2005, 10:51 AM
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.
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