OMC 3.0 L block

[m2hunt]

Hello
I bought a 1990 18ft lazer with a 3.0 OMC the man said he winterized the motor once i got it in the water i noticed a 6" crack in the block and a freeze plug popped out on the bottom of the manafold .
I need to know if i can take all the guts out of this motor and find a chevy car or truck engine just for the block can i do this kind of swap looks like a chevy 4 cyl

 

[Bondo]

Re: OMC 3.0 L block

find a chevy car or truck engine just for the block can i do this kind of swap looks like a chevy 4 cyl

Ayuh,...

while they are Chevy motors,...

They are Totally Different than the 4 cylinders used in cars,+ trucks.....
Totally different Castings....

 

[m2hunt]

Re: OMC 3.0 L block

what year of blocks can i use for this i have a friend with a older 140 merc can i use this block or do u know were i can get just a block the motor i have starts right up but when it gets warm it seems to sease up until it cools down 1 cyl has low comp. thanks for your help

 

[chiefalen]

Re: OMC 3.0 L block

Yea you can use that 140. You will have to change the riser and coupler.

Is it a good running motor?

 

[jmason231]

Re: OMC 3.0 L block

so u can use a merc 3.0L 140 in place of a omc 3.0L 140?

 

[chiefalen]

Re: OMC 3.0 L block

Same block. Both marine. Why not?

Change out the flywheel maybe, or just see if the coupler switch over should.

Different riser, if old one good use it.

Should work no problem.

Just switch the motor and leave the bell housing alone.

I just took my 2.5 out.

 

[m2hunt]

Re: OMC 3.0 L block

any way if someome has a good block 3.0 let me know the motor he has is a 120hp