I have seen mention of Merc BBC exhaust elbows that came in a stainless steel version. Since I boat in salt water, this would be a nice addition to my boat. So a few questions-
1) is the entire elbow stainless steel, or just some minor inserts on the inside?
2) are they an exact replacement for the late-model 454/502 exhaust elbows ?

Thanks in advance.

You sure the other post aren't talking about aluminum manifolds with stainless risers?

Cast iron manifolds with Merc stainless elbows were available on 502/454 I think inboards in the late 80's. I heard that the different materials caused the joint to leak over time so the stainless elbows were discontinued. I had thought about those for my 2000 454 in the past also.

Nope- they look just like standard Merc Exhaust elbows but are reported to be stainless steel. I am not sure if this is just some parts on the inside, as the outside is painted black just like iron elbows. I do not have direct access to them, otherwise I could try the magnetic test- most stainless is non-magnetic.

From what I understand the "elbows" or "risers" are entirely cast out of stainless, like the thermostat housings used on the 502 MPI motors.

They did look like they were a cast piece. They also had a different look to them from the iron parts - very easy to tell which is which. They are sometimes available on Ebay.

Yes, I see them on there from time to time, although the asking prices are quite high.

I have 2 sets of these stainless merc elbows off of my 502 mag. if interested

PM sent.

you are right,they are cast stainless steel.i had them on my 27fever.i removed them and went aftermarket.anybody need a set p/m me