What engine sizes will bolt up to a Alpha 1 stern drive?

Question

I am wanting to change out a bad inline 4 cyl motor in my boat to something bigger. The outdrive is a Alpha 1. I need to know what different motors this Alpha 1 will handle and bolt upto. The boat is a 1987. Any help would be apreciated.

Thank you.

Answer 1

In addition to richards answer, which is all basically correct, 4 cylinder motors have only 1 mount in the front, while a V6 has two, on the sides.  Does your boat have stringers/strongbox that will accomodate a bigger motor?  My advice.... rebuild what you have, or buy a remanufactured 4 cylinder.  The reman will be 20 HP more.  If you want a faster boat, buy a faster boat.

Answer 2

Even though you have an alpha, it comes in at least three different gear ratios.  So you could have a 4,6,and 8 cly engine and an Alpha drive.  The "Y"pipe would be a "single for the 4 cly, where a 6 or 8 would need the  "Y" shaped pipe.  Also the bell housing is different.  You might find it better to cash out the current boat and pick up a used boat, using the money you saved by not trying a complicated engine exchange! Best of luck!!!

Answer 3

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