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Re: 1974 340 Boat engine ?
[Re: MCTPhoenix]
#1901317
08/28/15 07:47 PM
08/28/15 07:47 PM
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Joined: Jun 2010
Posts: 1,144
wellington ohio
68-scatpack-rt
In thin ice
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In thin ice
Joined: Jun 2010
Posts: 1,144
wellington ohio
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I certainly wouldn't assume a 40 year old marine block isn't thin.
Sonic test the cylinders!
I've never heard of a "marine" block. Maybe that's a Chrysler thing as both the ford and gm "marine" engines are no different than the automobile blocks. Just machined for the marine environment.
Do you have some data to back up the high Nickel "marine" specific casting you're talking about?
unions....the folks who brought you the weekend!
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Re: 1974 340 Boat engine ?
[Re: MCTPhoenix]
#1901334
08/28/15 08:06 PM
08/28/15 08:06 PM
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Joined: Jun 2010
Posts: 1,144
wellington ohio
68-scatpack-rt
In thin ice
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In thin ice
Joined: Jun 2010
Posts: 1,144
wellington ohio
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Also, not saying you're not correct about the high nickel blocks.
Just wasn't sure if it was more than urban lore that gets thrown around.
Are you saying that they had "marine" specific castings or that all chrysler castings were high in nickel during that time?
unions....the folks who brought you the weekend!
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Re: 1974 340 Boat engine ?
[Re: bryansgarage]
#1904344
09/01/15 07:52 PM
09/01/15 07:52 PM
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Joined: Aug 2007
Posts: 294
Phoenix, AZ
MCTPhoenix
OP
enthusiast
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OP
enthusiast
Joined: Aug 2007
Posts: 294
Phoenix, AZ
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We have a Chrysler Marine Facebook page that would get you a lot of good answers to your questions. Could you post a link to that site? Also, It seems my 340 has 318 heads on it 2843675 and a date code of 1203 (120th day of '73) Is this the correct head? Why would they put 318 heads on a 340? With a digital caliper the valves (outside to outside) measure 1.82 and 1.52 Thoughts?
Last edited by MCTPhoenix; 09/01/15 07:54 PM.
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Re: 1974 340 Boat engine ?
[Re: bryansgarage]
#1904820
09/02/15 12:39 PM
09/02/15 12:39 PM
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Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
minivan
master
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master
Joined: Jan 2004
Posts: 9,066
Eugene, Oregon
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Marine specific blocks as far as I have been able to gather from the so called "experts". True or not , I couldn't positively say.
A marine engine holds water only running and pressurized by the pump, shut it down and it drains off like a leaky radiator. If they are winterized , you drain out all the water from pet-cocks on the side ,the hoses get disconnected and dumped ,pet cocks on the exhaust manifolds drain them. Anything left gets diluted with a RV antifreeze.
A boat you could get an engine from ,means no one cared anymore and chances are it wasn't winterized.
If he wants to save the 340 ,getting it sonic checked for core shift is a smart plan. Best way to winterize an inboard is to pull off the hull intake hose and stick it into a bucket of RV antifreeze then start and run until you see the antifreeze out of the exhaust.. If you have a hot water hose (for wet suits) or heater, these need to be addressed separately....
Last edited by minivan; 09/02/15 12:40 PM.
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Re: 1974 340 Boat engine ?
[Re: bryansgarage]
#1905174
09/02/15 07:11 PM
09/02/15 07:11 PM
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Joined: Aug 2007
Posts: 294
Phoenix, AZ
MCTPhoenix
OP
enthusiast
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OP
enthusiast
Joined: Aug 2007
Posts: 294
Phoenix, AZ
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Just type in Chrysler Marine Found it, thanks, I see my friend is on it too. Mike
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