3.0 intake interchangeablultu

[1966starcraft18ft]

Hey guys, got an update and question. For a backyard mechanic kinda guy, I have determined that the 140 in my 76 Silverline is saveable.

As far as intakes go, are they interchangeable? As in, can you take an intake off a newer 3.0 that’s got the large base carb and bolt up to my motor? Just having a hard time finding a suitable small base Rochester to put on this thing but the large base ones, there seems to be a plethora of choices.

 

[1966starcraft18ft]

And apparently I can’t spell today either.

 

[Bt Doctur]

it should not be an issue PROVIDING the riser bolts are a match to it

 

[matt167]

There are 2 or 3 different risers used. One style that is probably like you have where it goes straight back and has a small outlet. A second style that has a larger opening but goes off to the side and I think a third that uses a different bolt pattern on the riser base. As long as you get something that will fit your old riser your golden. Not sure you can swap the exhaust tube that mounts to the transom assembly and use the newer style riser.

 

[Fun Times]

Just in case that maybe the following info could be of a little help somewhere for you too.

MerCruiser Exhaust Manifold Adapter Plate Kit - High Output 3.0L engine

Exhaust Manifold Adapter Plate Kit - GM High Output 181 c.i.

michiganmotorz.com

Mercruiser 2.5L & 3.0L w/ Rochester Carb - NO Choke Stove

Michigan Motorz: your one-stop online shop for new & remanufactured marine engines, parts & accessories. Fast shipping, expert support worldwide.

michiganmotorz.com

 

[Scott Danforth]

The split is 1990 and below or 1991 and above

For your 1976 motor, any 1990 and older manifold will work. Just get a new one