Mercruiser 7.4 intake manifold swap?

[NateZ]

I'v got two mercruiser 7.4L motors in my boat. The intake manifolds are looking pretty rough on the outside. I also happen to have two GM 6269318 aluminum intake manifolds (with marine waterjackets, rectangular ports) never been used. It is a 454 / 502 part. Would these high rise aluminum intakes bolt on with no other modification/tuning to the motor?

Nate

 

[mciaio]

Re: Mercruiser 7.4 intake manifold swap?

Yes. Merc 7.4 and Chevy 454 parts are interchangable. Running in salt on a raw water cooled engine might not be too good for the intake though. Longevity would be an issue.

 

[NateZ]

Re: Mercruiser 7.4 intake manifold swap?

Ok wanted to make sure the stock height Vs. the high rise aluminum ones wouldn't change anything.

Nate