1983 Mercruiser 260 replace w/305??

[picklenjim]

Re: 1983 Mercruiser 260 replace w/305??

There is a difference between the 305 and 350 exhaust manifolds. The last bolt hole to the rear on the passenger (starboard) side is is in a little different location, about 1/2" off. I had a 79' El Camino with a 305 that I switched to a 350. When I came to this problem I talked to some people about it.A guy told me that he put high temp sealer in that area and left the bolt out. That's what I did and it worked fine,never had a problem. However on a marine manifold I don't think I would try that beings you have water flowing through there.There fore you may have to get a starboard side 350 exhaust manifold.

I still have the 305 engine if anyone wants it for FREE.It's fully disassembled on a shelf in my basement,all the parts.Ran fine just used a lot of oil.If interested I live in the St.Charles/St.Louis Missouri area. Send me a PM.

 

[SuperNova]

Re: 1983 Mercruiser 260 replace w/305??

There is a difference between the 305 and 350 exhaust manifolds. The last bolt hole to the rear on the passenger (starboard) side is is in a little different location, about 1/2" off. I had a 79' El Camino with a 305 that I switched to a 350. When I came to this problem I talked to some people about it.A guy told me that he put high temp sealer in that area and left the bolt out. That's what I did and it worked fine,never had a problem. However on a marine manifold I don't think I would try that beings you have water flowing through there.There fore you may have to get a starboard side 350 exhaust manifold.

Marine maniflods don't use the bolt hole you are talking about, so it wouldn't matter. It's not the last bolt hole, it's the second to last one.