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Old 09-16-2007, 09:59   #1 (permalink)
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Default 251 marine engine

Well I stumbled accross some chrystler 251 marine flatheads. It appears to be the same block as a civi 251 with some extra goop. Will the crank work in a Canadian 251? I will also have some of the marine stuff for sale on ebay in the coming months. If anyone is rebuilding one for a boat let me know.
gear driven cam,oil cooler, marine intakes, updraft Zeinith carb,prop drive trans,and so on..
The crank look good I just wonder about the crank tail shaft? It looks bigger but still has the gear drive on it..
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Old 09-16-2007, 14:17   #2 (permalink)
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Default RE: 251 marine engine

It would be interesting to know the power curve on the marine cam. Given that marine applications demand maximum torque, the cam may be just what the doctor ordered.

My guess is that the crank will bolt right up to the standard automotive (perhaps the more appropriate word should be "truckomotive" drive train.

Keep us posted.
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Old 09-16-2007, 16:12   #3 (permalink)
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Default RE: 251 marine engine

I never thought of the cam torc curve.. I do know they are re-balanced built for sustained RPM's.. Its a real neat set up.. All gear driven and was mounted in the boat backwards... I sure hope this crank will work and has no cracks. All the bearings are still standard so I dont think it has ever been rebuilt. I also like the gear driven oil cooler. I was trying to figure out if I could mount that on the motor for a M37.. this would reduce engine heat and therfore reduce wear..
Whats the length of the rods on a 265? and a 251? .. I guess it could be either?..or maybe a 237
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MVPA#22218
1954 Canadian M37 W/W "Oliveoil"
1971 M816 "Yard Whore"
1952 Curtis Wright M44/M34 "Mo gas momma"
1952 M42 project "money pit"
1968 M109A2 "camper special"
1986 M1028,1984 M1028,1983 M1028,1985 M1009
The list go's on but that would be bragging.
"I don't think the United States needs super-patriots. We need patriotism honestly practiced by all of us"
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Old 09-16-2007, 16:57   #4 (permalink)
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Default RE: 251 marine engine

Since you are surrounded by water on 3 sides, why not call a few old marinas in your area. Maybe you can find a boat mechanic with some knowledge of this motor and maybe they can tell you what you need to know(as far as interchangeability). Good luck.
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Old 09-16-2007, 20:00   #5 (permalink)
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Default RE: 251 marine engine

One thing to verify, I know that the marine version Chrysler 440 runs backwards compared to the automotive version. You may end up with 4 gears back wards and one forward
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Old 09-16-2007, 21:01   #6 (permalink)
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Default RE: 251 marine engine

The crank should turn either way.. The gears driving everything else might be reverse..
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"The right thing at the wrong time is no longer the right thing" Grandma Mattson
MVPA#22218
1954 Canadian M37 W/W "Oliveoil"
1971 M816 "Yard Whore"
1952 Curtis Wright M44/M34 "Mo gas momma"
1952 M42 project "money pit"
1968 M109A2 "camper special"
1986 M1028,1984 M1028,1983 M1028,1985 M1009
The list go's on but that would be bragging.
"I don't think the United States needs super-patriots. We need patriotism honestly practiced by all of us"
Dwight Eisenhower
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Old 09-16-2007, 21:04   #7 (permalink)
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Default Re: RE: 251 marine engine

Quote:
Originally Posted by doghead
Since you are surrounded by water on 3 sides, why not call a few old marinas in your area. Maybe you can find a boat mechanic with some knowledge of this motor and maybe they can tell you what you need to know(as far as interchangeability). Good luck.
I have and will continue to ask some of the old boat guys. The problem is they used these in Chris Chrafts and that crowd around here tend to be a little ... well... stuck up and of a higher pay grade. They dont like to talk to us redneck OD heads.. But I will keep trying.
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"The right thing at the wrong time is no longer the right thing" Grandma Mattson
MVPA#22218
1954 Canadian M37 W/W "Oliveoil"
1971 M816 "Yard Whore"
1952 Curtis Wright M44/M34 "Mo gas momma"
1952 M42 project "money pit"
1968 M109A2 "camper special"
1986 M1028,1984 M1028,1983 M1028,1985 M1009
The list go's on but that would be bragging.
"I don't think the United States needs super-patriots. We need patriotism honestly practiced by all of us"
Dwight Eisenhower
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Old 09-16-2007, 21:09   #8 (permalink)
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Default RE: Re: RE: 251 marine engine

Living as close as I do to the St Lawrence River, I know the type!
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Old 09-16-2007, 23:36   #9 (permalink)
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Default RE: Re: RE: 251 marine engine

Quote:
The crank should turn either way.. The gears driving everything else might be reverse..
The crank may in fact run either way, but the cam, no way. I am in no way a marine engine expert, (I just play one on tv) but I do collect antique engines. That engine may run forward I duno? Just saying check and find out!
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Old 09-17-2007, 10:38   #10 (permalink)
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Default RE: Re: RE: 251 marine engine

On other marine engines, chevrolet for example, they take out the chain drive for the timing set and replace it with a gear set that allows the crank to turn reverse rotation but still allow all the other jazz (oil pump, distributor, cam and valve train) to run its normal direction. I would guess it would be set up on the same principle or it could pull intake through the exhaust ports-- ??
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