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Old 12-04-2011, 02:11 AM   #1 (permalink)
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mercruiser engine??

I've found a mercruiser 502 big block for sale, my question is how does a marine engine differ from an auto one? can i use a mercruiser block in my truck? cheers
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Old 12-04-2011, 07:15 AM   #2 (permalink)
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Should be the same minus say exhaust manifolds, acc. drives etc.

Here is a merc motor
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Old 12-04-2011, 09:27 AM   #3 (permalink)
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There is quite a bit of differance in the full motor but little in the major part of the motor.The fuel delivery is a water-cooled insulated multiport injection system designed to use incoming water to cool the fuel rails in order to run a lower octane at any rpm level without getting detination and maintain pressure and temp.The alt is a 65amp unit.The engine has a single-point air-actuated water-draining system, this is a small valve on the side of the block that allows you to drain the block at any time in order to winterize or just clear the block of dirty water. As far as if it can be done, Yes it can and has been done many times. The block is the same part # and build as the regular street gm 502. It is a cast block, forged je pistons, manley rods, crane valvetrain, Heads crank and block from gm performance.Puts out around 430hp. Hope this helped

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Old 12-04-2011, 10:19 AM   #4 (permalink)
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I don't know if I'd run one, is it from fresh or salt water? The saltwater stuff never stop rusting.

But if the price is right, why not
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Old 12-04-2011, 01:01 PM   #5 (permalink)
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thanks for all the info, its saltwater,the guy says dyno'ed at 546hp! its for auction so may go for good money yet
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Old 12-04-2011, 07:06 PM   #6 (permalink)
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beware some boat engines are designed to run backwards. this is for twin engine applications, could make your newfound "deal" a giant POS. second, that engine may have made 500+ hp when first built, but remember a boat engine lives a hard life. imagine being loaded full up and pulling a grade the whole time, that is the life of a boat engine. also, inside the water jackets can get seriously rusted/pitted. sacraficial anodes can help with this but it's no guarantee. personnally if i couldn't hear it run before i bought it, i would stay away from it, it may cost more to fix than it's worth. BTW, big block chevy's are a dime a dozen at pick and pull.
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Old 12-04-2011, 07:55 PM   #7 (permalink)
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I would buy it for the reasons stated. Boat engines have a hard life. Why was the engine pulled?

I have heard that the biggest problem with the raw water cooling (salt water cooling) is that when run with anti-freeze the mixture is even worse as the salt is embedded in the rough cast surface and the salt water/anti-freeze react. I have been told never to use one for this reason. I am getting my hands on a Gen VI 454 that was in a fishing boat here, but was closed system cooling with antifreeze and a radiator so I felt comfortable with it, and it is already bare, 4 bolt block ready for rebuild.
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Old 12-05-2011, 01:59 AM   #8 (permalink)
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i think i'll leave this one where it is for the reasons stated,an engine rusting from the inside sounds like no fun!
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