Automotive Engine Base for 3.0L 181ci Mercruiser

[pjaec001]

I know there are differences in Marine and Automotive Engines and I know what those important reasons are, but I am curious as to what the automotive equivalent is to the 3.0L 181ci 4cylinder Mercruiser Engine is.
I know its a GM Motor, but cant seem to find one that matches up by any GM years, makes, or models.
Anyone here know?

I recently just replaced my starter on this and did so with the proper marine rated starter, but was curious as to what the cost would have been using the automotive one.
I also tend to need to replace the starter relay frequently and want to see if there is a difference in the marine or auto version.

[CptBill]

You'll need to get the # off the block and look it up in a cross ref. chart or just put it in the www and see what comes up. The basic block is the same it's all the add on stuff that makes the difference. Of course some blocks are a little different when you get into the bigger motors, things like 4 bolt main bearings and so on, also' most of the time they use engine platforms that are designed for trucks not cars.

[04FXdwgi]

The 3.0 / 181 was an engine used in the Chevy II Nova (was a 151 in the car), back in the 70's. Basically 1/2 of a 327 engine and some of the parts of a 327 fit. I had one in an 18' Bayliner Eagle and rebuilt it with some 327 internal parts and a hotter cam. Was a great little engine.

Pretty rare to find a good auto one these days. I would say your best bet would be to get used (but good) one from a place like fleabay or Craigslist

[Daddubo99]

The biggest difference is brass freeze plugs, and stainless-steel head gaskets and the V-8's have 4 bolt mains.