hey guys
I have a friend that has a new reman. GM crate 350 marine otor that he will sell to me for only $600 bc he has no use for it any longer. Anyway, I have a 87 4MULA, with the LG4(anemic even w/ all the mods i'v done), my qustion is, will this motor work in my car, I figured no better place to ask then here! PLEASE!!anyone w/ ideas/prblms/knowledge with this swap give me any/all info you know! thanks a lot

 

The marine motor will work, as far as that goes. The thing to check is the crank flange; your 87 car has the one-piece rear main seal design, and the other motor may have that or the 2-piece design. You might have to change out the flywheel or flexplate to the other style. As long as you get the same size of that, it should go right in.

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"So many Mustangs, so little time..."
ICON Motorsports

 

I'd just make sure it's not a reverse rotation.

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, Jon (91 RS too many mods to list), getting new engine in summer

 

thanks guys, any other things I should look for?

 

It is definately reverse rotation. Meaning that if it has been run it will prolly need new main and rod bearings, Now check my logic here: If it was run in reverse rotation the bearings have beens seated for that direction, now wouldn't you need to replace them??? ANd what about the cam??? Wouldn't the grind be a little backward?? Just a thought. But other than that Marine motors are by far the highest quality motors out there. Think about it. A motor that is built to run at WOT all day long??? Hmmmm, sounds like a good motor to me.

Later,
Lars

BTW: Yes it will fit in perfect

 

OK guys, thanks alot, I changed my mind and won't use it, too much hassle rite now.

 

Normally, reverse rotation motors were only used in boats with two engine. The torque from both engines going against themselves made it easier to steer. You should check the motor first, before ruling it out. Most of my engines were ex-marine engines and are even 4 bolt.

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1992 Pontiac Firebird 350/Six Speed
1987 Toyota Pickup 383/500+ HP

 

The motor in my boat (Merc F*rd 302) rotates the correct way, as do about 95% of all the boat motors I've worked on. Outdrive motors pretty much always rotate the usual way, in twin setups they just run one drive in "forward" and the other in "reverse" with different props to get that effect. The only systems that have opposite-rotating motors are inboard twins, and there are very few of those any more that use dinky motors like 350s. They're usually big blocks in the smaller boats and diesels in the rest.

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"So many Mustangs, so little time..."
ICON Motorsports