will a 35 hp powerhead fit on a 48hp mid? OMC

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gotboostedvr6

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I have a 81 35 hp PH and a 8748 hp complete motor with low compression.

# 1 Will the powerheads interchange?

# 2 Are the bore sizes the same?

# 3 Will the 48 hp front half fit the 35 hp block?

if not what OMC 2 cyl powerheads fit what and interchange with what
 
WillyBWright

WillyBWright

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Re: will a 35 hp powerhead fit on a 48hp mid? OMC

Nope, nope, nope. 35 is the largest of it's block group (20, 25, 30, 35) and 48 is just one above the smallest of its block group (40, 48, 50, 60).
 
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gotboostedvr6

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Re: will a 35 hp powerhead fit on a 48hp mid? OMC

ok so where do i find a 60 2 cyl ph?

also there are 60 hp 3cyl i didn't think there were 60 2cyl....
 
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gotboostedvr6

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Re: will a 35 hp powerhead fit on a 48hp mid? OMC

another thing i know the large twin lowerunits fit on tripples but will they also fit the small bore twins?
 
Chinewalker

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Re: will a 35 hp powerhead fit on a 48hp mid? OMC

No 2-cylinder units will fit any three-cylinders and vice-versa. Some similararities and shared parts, depending on the year, but the driveshaft splines are different between the two powerheads so they will no swap straight-up.

And, yes, there was a 2-cylinder 60hp offered for several years in the 1980s prior to the switchover to propshaft rated horsepower...
- Scott
 
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gotboostedvr6

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Re: will a 35 hp powerhead fit on a 48hp mid? OMC

awsome thanks for all replys thus far... i have one more

I picked up a 71 50 hp electric will the powerhead bolt up if i use the 87 48 front half?


one more just to make sure im being specific...
I'm wondering if a 71 50hp electric powerhead with a 87 48 hp front half will or will not fit a 87 mid?
 
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gotboostedvr6

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Re: will a 35 hp powerhead fit on a 48hp mid? OMC

also are these motors loopers or crossflows?
 
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gotboostedvr6

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Re: will a 35 hp powerhead fit on a 48hp mid? OMC

ok they look the same so here is my plan.

The electric PH is off here is a pic of the base w/o the exhaust tuner installed...
50hpEbasepic.jpg


heres my plan

I'll be using the 48 front half on the (e) 50hp block use the 48hp crank rods and pistons. Cut the piston even with the exhaust ports, but only after the ports have been squared and opended up slightly. I'll also port the intake and clean up the casting flash.

Next will be to go 4 sizes larger on the high speed jets for break in. I'll use all the 48hp electronics, charging system and flywheel.

i hope the 50 block doesn't need a bore
 
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