ENFORCER24

Does anyone know if someone makes chrome stainless round style risers that bolt to stock mercruiser manifolds?

also , for a stock 7.4l 330 hp engine , whats the best bang for buck for 25-35 more ponies?

thanks in advance

formula 382 sr-1

Yes hardin marine and I think Imco make some .CP Performance carry hardin. 272 FORMULA FOR SALE

Knot 4 Me

Camshaft change.

Pat McPherson

I have used the Imco stainless riser on the stock manifolds but you will not gain much.
For bolt on upgrades: Replace your intake with one of these.
http://www.holley.com/8017.asp
and change the entire exhaust with a good flowing alum manifolds and rises like Stainless Marine.

ENFORCER24

how long would an aluminum intake last in a raw water cooled application , or is there slip in bronze jacketing that can be used ?
anyone ever used the aluminum manifolds/risers from GLM?
they look cost effective and supposedly have the indevidual runners that help your power production

Pat McPherson

No bronze insert in that manifold. An aluminum intake will last for a few years untreated. You can have in hardcoat anodized for added protection.
The GLMs are a decent product but you will not gain much power. The least expensive good flowing manifolds are Revolution Marine.

cuda

I have aluminum Merlins in my Formula. I don't know how long they were on the boat before I bought it, but I've had it four years, and I just recently pulled the t stat housing to check for corrosion inside. Not a sign of it. Flush 'em reall good, and they will last a long time. For people who say aluminum won't last in salt water, what do you think your drive is made from?

ENFORCER24

As always OSO community is the best