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Looking to pick up a 454 for my Sleekcraft. Kinda new to the boats scene. Is there a difference between a car motor and a marine motor? What are the differences? Thanks for any help.
 

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Yes they are different. How different will depend on intended use & drive selection. Clearances are the biggest area where they will differ.
 

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Looking to pick up a 454 for my Sleekcraft. Kinda new to the boats scene. Is there a difference between a car motor and a marine motor? What are the differences? Thanks for any help.
454's were built for automobiles, but can be built to handle higher rpm's to make them safe for high rpm's that we run them in. anyone can put a motorhome 454 in a jet boat, and it will run fine. by changing the motor internals (cam, lifters, rockers, manifold, carbs, fuel systems, ect...) will make it a much more stout motor. these upgrades will usually keep the motor happy and give you years of run time on the river.
 

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main difference is clearences for cold water cooling system and things like gasket materials. Cold water keeps the cylinders tighter while the combustion chambers still heat up and pistons expand, so that needs to be compensated for...Also many of the subsytems (ignition, starter, carb) need to be sealed to protect for sparks that may ignite fuel fumes in an enclosed engine compartment...
 
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