automobile 350 engine convert to marine engine question

[doberman-guy]

Mine is a 1980 230hp 350 and i may need a new block. Will it have to be a 1 piece rear main seal or a 2 piece rear main seal? Also does it have to be close to the same year as mine?

 

[Bondo]

Re: automobile 350 engine convert to marine engine question

Ayuh,... 1980 is a 2 pc seal motor,...
Yes, ya need another 1 just like it...

There's No way to adapt yer drive to a 1 pc seal motor, the flywheels are different...

 

[doberman-guy]

Re: automobile 350 engine convert to marine engine question

Thank you, I hope i wont have to search.

 

[Howard Sterndrive]

Re: automobile 350 engine convert to marine engine question

the new crate 350/290HP from GM has always been and is is still 2 pc rear main (old school like pre-1987)
So if you want you can buy new, or look for a used crate -they sell lots of those motors.
But generally, 2 pc rear main 350's are about as rare as mosquitos in Winnipeg

 

[91rr]

Re: automobile 350 engine convert to marine engine question

I just replaced mine with a gm crate 350 with the 2 piece rear main. Picked up a brand new one for $1552 from my local gm dealer.