1984 3.7 swap to a 1979 898

hadaveha

hadaveha

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Mar 17, 2009
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the donor boat mercruiser 898 (chevy 305) swap with my 1984 3.7 does this make any sence, the donor boat can be bought super reasonable. I was going to go with 4.3 but I found this donor boat and just wanted to explore the idea.
thankyou everyone for your ideas
 
achris

achris

More fish than mountain goat
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27,468
Re: 1984 3.7 swap to a 1979 898

As long as you get the drive and transom plates, then swap EVERYTHING over. The 898 will not bolt up to the 1984 inner transom plate.
 
M

mitchcraft15cc

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Re: 1984 3.7 swap to a 1979 898

achris said:
As long as you get the drive and transom plates, then swap EVERYTHING over. The 898 will not bolt up to the 1984 inner transom plate.
Click to expand...
Anything can be made to fit with enough time and money, swap everyything as Achris says. You might also have to modify the engine mounting in the front.
 
S

stonyloam

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Re: 1984 3.7 swap to a 1979 898

You might want to consider the size of the boat you are swapping into, the V8 will be about 400 pounds heavier than the 3.7.
 
hadaveha

hadaveha

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Re: 1984 3.7 swap to a 1979 898

yes I knew it would be quite the job, I think what Im really asking is more about the 898 is it a good step up from the 3.7 and how does is stack up against the 4.3
 
achris

achris

More fish than mountain goat
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Re: 1984 3.7 swap to a 1979 898

hadaveha said:
yes I knew it would be quite the job, I think what Im really asking is more about the 898 is it a good step up from the 3.7 and how does is stack up against the 4.3
Click to expand...

Believe it or not, the 4.3 is a better engine...

Chris.....
 
Bondo

Bondo

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Re: 1984 3.7 swap to a 1979 898

achris said:
Believe it or not, the 4.3 is a better engine...

Chris.....
Click to expand...

Ayuh,.... The 4.3l is 'bout 100 lbs lighter, 'n 'bout the same horsepower as the 5.0l,...
 
thumpar

thumpar

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Jun 21, 2007
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Re: 1984 3.7 swap to a 1979 898

Yep the 4.3l is much better than a 305. They make about the same power. The only way I would switch it out to a V8 is for a 5.7.
 
S

stonyloam

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Re: 1984 3.7 swap to a 1979 898

the current outdrive would be correct for the 4.3, not so much for the 305.
 
achris

achris

More fish than mountain goat
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27,468
Re: 1984 3.7 swap to a 1979 898

stonyloam said:
the current outdrive would be correct for the 4.3, not so much for the 305.
Click to expand...

Yep, 2 bbl 305 used a 1.65:1, 4 bbl used 1.50:1.... 470 and earlier 4.3 used 1.84:1
 
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