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318 exhaust manifold gasket

Posted: Mon Jul 14, 2014 1:06 pm
by oneviking
Hi, all.
I have a 32', 1975 Marinette with twin Chrysler 318s. I fired the engines yesterday and noticed a bit of a strange noise from the port engine. I traced the issue to a leaking exhaust manifold gasket around the 2 center ports. I took things apart, and sure enough the gasket is busted. I got some Copper RTV gasket maker, and it almost did the trick. Just a very slight leak now. My question is this; where can I find parts for these old engines, and particularly a good set of exhaust manifold gaskets? My boat is docked in Baltimore, MD.

Re: 318 exhaust manifold gasket

Posted: Mon Jul 14, 2014 1:27 pm
by DougDoty
I have been very happy with Marine Parts Source recently, I have been getting some things from them, this spring below is some of my needs they had available and I did check they have your gaskets !!

Thermostats for the 440's, the big ones !! hard to find,
Anti siphon valve for the Gen. made just like OEM , It got sticky and caused it to quit running, the shuttle pumps are poor a sucking so they gotta be good.
Westerbeke parts...

Re: 318 exhaust manifold gasket

Posted: Mon Jul 14, 2014 1:40 pm
by oneviking
Thank you! They did have them in stock! :D

Re: 318 exhaust manifold gasket

Posted: Mon Jul 14, 2014 3:27 pm
by Fastjeff
For the record, stock AUTOMOTIVE 318 exhaust ports are gigantic compared to the marine ones, so auto gaskets will leak. You need to use early 273 cube Mopar V-8 gaskets if you can't find the marine ones.

Jeff

PS: If you can, always use the one piece (vs. three piece) gaskets or you'll go batty trying to orient the end ones correctly.