3.8 to 4.3 engine swap

[Dman2345]

I have a 83 OMC 3.8 V6. I bought a 4.3 long block, but my exhaust manifolds don't fit. I would like to know if I bought new manifolds for a 4.3 if everything would match up? Or would it be the best to have my 3.8 heads rebuilt?<br /> Just found this forum, and it is my first post so if any more info is needed let me know.<br /> Thanks, <br /> Dman

 

[Trent]

Re: 3.8 to 4.3 engine swap

Manifolds are just the beginning of your problems!! Lots cheaper to fix the 3.8

 

[horndog]

Re: 3.8 to 4.3 engine swap

I assume the 3.8L is a ford, and the 4.3 is a GM, too different motors! Its not like the difference between a 289 and a 302 where its the same long block.

 

[Dman2345]

Re: 3.8 to 4.3 engine swap

Both motors are GM. They are the same block, I was told by the marine parts store that I bought the 4.3 that everything would bolt up on a short block. They didnt have a short block so they gave me a long block for the same price. The decision is to replace the exhaust manifolds or have the 3.8 heads rebuilt.<br /> The question is does anyone know if the 4.3 manifolds will match the exhaust tubes that go to the out drive.