1980 470 Mercruiser

[SlowGin_III]

Can I replace my cast iron exhaust manifold and riser with the later aluminum pieces and what parts do I need to match up to the exhaust without replacing the inner transom plate?

[spareparts]

you can replace it, but unles you find a good used dead engine to get the parts off of,its going to be expensive$$$$$$. personally, I'd prefer the cast iron manifold, they gave a lot less trouble. I think your engine has the 3" exchanger, you would have to upgrade to teh 4' if you run the alumium manifold(aluminum transfers more heat)

[cfelton]

Look on ebay, theres manifolds and risers on there for sale now. Just look under mercruiser 470 or 3.7 or 224. You stand to save alot of money!

[cfelton]

They also got some heat exchangers for sale on ebay!