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Repowering 57l 1989 Mercruiser to a new Chevy

saffari

New member
"G'day,

Just chassing


"G'day,

Just chassing some info on swapping a 1989 5.7l Mercruiser (bravo2 leg) to a new (long motor) chevy 5.7l and any complications that may be involved. Some mechanics say its easy and interchangable and others say its a major problem riddeled opperation.

Can anyone help me clarify this?"
 
The only thing you might have

The only thing you might have a problem with is intake manifold bolt pattern. 96 and newer 350 has only 8 smaller intake bolts. 87 to 95 has 12 intake bolts at a different angle. If engine is carbed you just need correct intake for engine and carb. If fuel injected your best bet is to get a remanufactured engine specific to your application.
 
"I'm repowering with a 200

"I'm repowering with a 2006 5.7 vortec, replacing the 1994. I had to get a vortec (8 bolts) intake. I transfered the motor mounts, bellhousing, wiring harness, ignition, and all sensors from the old motor. Also the newer blocks do not have provisions for a mechanical fuel pump so an electric one is going on."
 
Thanks for the feedback!!!

Thanks for the feedback!!!

I have given the block to a specialist chevy workshop and the fella has done heaps of these and assures me that it is simple procedure. I am getting the throttle bodys presure tested now and then i ll take it from there. Now that i have found out that there is no difference between Merc and Chev i dont understand why anyone would even think about repowering with a Merc. Unless your made of money!?!

Once again thanks...
 
"Well, just because you haven&

"Well, just because you haven't received correct info until now it doesn't mean there is really no difference between an automotive chevy engine and a gm marine engine.
Marine engines for example are designed to run at lower temps than in a car, therefore you need to have wider piston to cylinder wall clerances than in a car with better controlled cooling.
The block and the internals most likely have the same origin but when it comes to tolerances it is an assembly issue. I have gm parts catalogs for auto engines as well as marine/industrial engines and even though specific parts carry the same # all over, assemblies like short blocks do not. Just my 2c"
 
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