318 marine engine.

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moparfan68

moparfan68

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I found a 318 marine engine complete from carb to oil pan. Still has trans or pump still attached to it. I can get it pretty cheap just wondering if it's worth getting ?is there any value or should I just leave it alone. Thanks in advance
 
What year is it? Some of these had a factory four barrel single plane iron intake that would make it worthwhile, and it might be a good way to get into a four lug mount block with thick cylinder walls and a steel crank. It would definitely be worth investigating closer.
 
There are standard rotation and reverse rotation versions. A reverse rotation would not be great for a vehicle .
 
Most single engine boats had reverse rotation engines. If it came off a dual engine boat, it could be a clockwise rotation engine. I would get it either way. A crank kit is all it will take to remedy that....and of course whatever camshaft you want. Some of them had unusual gear drives for the camshaft, but once removed, the blocks are the same as far as bolt on accessories. I have never heard anything about them being thicker, but that's certainly plausible, since marine engines and parts are more heavy duty than their automotive counterparts.
 
obviously check for rust
and check block- if run cold in salt water they can be full of salt crust
both standard and reverse cams are still available
you might be able to flip it to the boat crowd
good motor
 
The cranks rear seal surface will have diverter grooves in the wrong direction because it is reverse rotation ...so in a car, standard rotation...it may piss oil out the rear main.

The thing I'd look for are the water cross over style head, they're closed chamber. Last digits are 234 of the casting number.
 
A 318? They are quite easy to come by. I would'nt mess with a marine teen.
 
Slightly off topic but I have a question...

67 318 vs 67 273 vs 69 318..

am I correct that the 67 318 and the 69 318 do not have interchangeable parts like a 67 273 and a 69 318 more or less do. ( hope this makes sense)
 
Dana67Dart said:
Slightly off topic but I have a question...

67 318 vs 67 273 vs 69 318..

am I correct that the 67 318 and the 69 318 do not have interchangeable parts like a 67 273 and a 69 318 more or less do. ( hope this makes sense)
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IDK but the pistons will be bore specific,lol.
Cranks are piston specific,
And pop-up pistons do not play well with closed chamber heads.
Early models had lightweight rods, while smog era teens used 340 type rods but with pressed pins..
Otherwise from 67 on,almost anything goes.
The 69 318 was a high-compression 9.something engine; 9.4 I think.
If you are building a performance engine, it doesn't really matter, cuz you are gonna be replacing almost everything anyway. And if doing a stock rebuild, from a core, it still doesn't matter.
The only fly in the ointment is the early 273 heads (65 and older) with the small odd-angle intake-bolts.
That's all I know.
 
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Garrett Ellison said:
What year is it? Some of these had a factory four barrel single plane iron intake that would make it worthwhile, and it might be a good way to get into a four lug mount block with thick cylinder walls and a steel crank. It would definitely be worth investigating closer.
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It's a 72 block it's a 4bbl with a carter carb still on it. I can get it for 100 to 150 for whole motor but I didn't k ow if it would be worth it or should I just let it get crushed. I'm goin back in the morning to get some parts off a mid 80s w250 truck that was brought in. When I was lookin at the w250 a guy workin in there stopped to talk to me and said if I like mopar stuff I should look at this "big block 442 they had" I said hech yeah I've never seen one before. Lol. it ended up being a 318 marine motor.
 
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MOPAROFFICIAL said:
The cranks rear seal surface will have diverter grooves in the wrong direction because it is reverse rotation ...so in a car, standard rotation...it may piss oil out the rear main.

The thing I'd look for are the water cross over style head, they're closed chamber. Last digits are 234 of the casting number.
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The 234 heads can they be used in a car or just marine application. Do they have any value ?
 
Does it have the ID plate on it?

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moparfan68 said:
The 234 heads can they be used in a car or just marine application. Do they have any value ?
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You can use them in a car, but I recommend you block the water/heat cross over though.
Use .019-.021 thick steel and copper rtv.
Otherwise water will flow through the manifold. Some who have egr ,its a must or your motor will eat coolant... but non egr is no worries. But the trick is too plug them, pipe plug on the block side would be nice.
The exhaust ports are blind due to the water heated deal and so they all flow even with no end gas passed around to the other bank...which is why they're the most desirable 318 closed chamber head imo.
 
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I run a 440 that was reverse rotation, just need the oil pan and cam and distributor only. And you have to polish the crank seal areas also.
 
How many 318's do you want for $100-$150? Why pay the price to toss away a lot of marine pieces you can't use. (unless you're building a boat)
 
toolmanmike said:
How many 318's do you want for $100-$150? Why pay the price to toss away a lot of marine pieces you can't use. (unless you're building a boat)
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If the marine motors or there parts had any value I would buy it if not i will just let it set.
 
I run an industrial 318 in my daily driver, it had very low miles so I changed the pan and water pump housing and threw it in the dart. It has the water crossover heads and they are great, seems to keep the carb an even temperature even on the hottest days.
 
Look on e bay for the parts value think I sold the cast oil pan over 200 and a revers distrib is 100 easily. Exhaust manifolds are big money also on them.
 
halifaxhops said:
Look on e bay for the parts value think I sold the cast oil pan over 200 and a revers distrib is 100 easily. Exhaust manifolds are big money also on them.
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Once I got to scrap yard and looked it over it was obvious it had sit for awhile lots of rust. The exhaust manifolds looked like they had froze and cracked. I pulled distributor and a few parts and left the rest.i got quite a few parts off 88 w250 too while I was there.
 
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