So I recently walked around my yard, being bored and all, and I spy a few four cylnder engines sitting around, all were marine engines from when my dad was in buisiness and they look like they were stripped out and are in one piece...

Should I even attempt a swap into a fiero with such an engine?
I've been reading up and it seems to me that the block is aluminum and the head is iron out of a ford 460.
How hard would it be to bolt it up?
I think I may need some adapter to fit it to a stock trans. (TH125c)
It shows an output of 170 or so HP, If I do, I should get a custom regrind to put out another 20 HP
and do some intake, head, exhaust work (bigger carb with custom intake, P&P, bigger valves and roller rockers, custom header... etc)

Awful lot of work for less than 200 hp. A 4.9 swap is straightforward and cheap, and a 3800 isn't that expensive or difficult either.

ya 4.9 is cheap if you use the autp tranny but im using a manual 5 speed and its gonna cost me when all is said and done around a 1000$ :-( and i got the motor for free

I feel its more of a unique thing, like "hahaha, look at me, no one else did what I did"
and the 3.7 is just raw... nothing super about it, so I assume that it could easily be a high horsepower powerplant.
the block is aluminum, and is barely bigger than a duke... making it lighter maybe?
what can be achieved in hp gains is easy to do, and I know how to do it...(not meaning I have the equipment)
I think it would be great. also, free is always better than paying for it...

it looks like it has the same bolt pattern as a 305, 350, etc... (the 3.7 was mercruiser MARINE SPECIFIC)
so what do I have to do to bolt it in to a fiero transmission?
fab up an adapter plate?

I have seen at least one Fiero with a Merc cruiser engine. If I can find the photos, and there is interest, I'll post them. It had to have been at least 10 years ago.

I believe you would have to replace the cam for automotive use. My 4.3 inboard is rated at 220 HP. When I replaced it, I had some discussions with a marine mechanic. He told me that the profile of the marine cam is designed for the engine to run under load and high rpm at all times. The automotive cam isn't, and neither can the marine cam be used in automotive, except possibly drag racing.

quote Originally posted by Old Lar: I have seen at least one Fiero with a Merc cruiser engine.

Damn - that 'unique' thing just went down the tubes! Now you are free to choose a more sensible swap!

Some similar threads:

https://www.fiero.nl/forum/Forum2/HTML/105044.html

And this one. The 7th post has info on parts and complete engine swap.

https://www.fiero.nl/forum/Forum2/HTML/110150.html