Mercruiser 3.0 Motor

[Bluefin91]

What year did Mercruiser come out with a 3.0 and would a 1985 block interchange with a 1991.
Thanks for any help.

 

[Scott Danforth]

the 3.0 came out in the late 70's

no, the block alone wont interchange with a 1985/1991 1990 was last year for the 2-piece RMS, 1991 and newer were 1-piece RMS (different block)

your not just replacing the block, you are talking complete long-block, or short block, correct. to replace a block requires machining, new bearings, new pistons, rings, etc.

Stick to complete motors, 1990 or older unless you get a complete long-tail

 

[Bluefin91]

Thanks, I guy has a 1985 block and flywheel, No head for it , my 1991 has a one piece main, I thought I might be able to use his block and the rest of my parts, looks like it will not work according to your post.

 

[Bondo]

Ayuh,.... You wanta buy a Complete motor, or atleast a Complete Long Block motor,....
Piecin' together a motor outa parts is a false-economy, frustratin' fool's errand,....

A complete runnin' barge, on a wagon, that's Rotten is another viable cheap option too,....
Take what ya need, sell the rest, 'n possibly make money,.....

 

[Bluefin91]

Thanks you guys are too good!