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1987 Force 235

Old 06-28-2021, 12:41 AM
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Default 1987 Force 235

Just purchased a 1987 Force 235 454 Alpha 1. I picked it up cheap the interior is in fair shape but the motor is Shot. I am building a new motor but unsure how much power can I put in front of an Alpha? I would really like to get 70 mph if it. Is that a pipe dream?
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Old 06-28-2021, 05:01 PM
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Well...there are a few Alpha One boats out there tickling that mark I am sure. A guy I used to run with years ago had a Carlson Signature Series boat...about 19' - 21' if I remember right, and he was running a built 383 that made close to 400 hp, PLUS a 125 hp shot of nitrous. Fastest I ever saw him run was 83 mph. He also liked to do this "rev, drop, rev, drop" thing that eventually allowed him to 'wheelie' the boat, it would be sticking straight up out of the water. I say all this to show that his particular Alpha One took a TREMENDOUS amount of abuse, and I never saw him break down.
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Old 06-28-2021, 10:30 PM
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Originally Posted by bajaman View Post
Well...there are a few Alpha One boats out there tickling that mark I am sure. A guy I used to run with years ago had a Carlson Signature Series boat...about 19' - 21' if I remember right, and he was running a built 383 that made close to 400 hp, PLUS a 125 hp shot of nitrous. Fastest I ever saw him run was 83 mph. He also liked to do this "rev, drop, rev, drop" thing that eventually allowed him to 'wheelie' the boat, it would be sticking straight up out of the water. I say all this to show that his particular Alpha One took a TREMENDOUS amount of abuse, and I never saw him break down.
So a mild 454 like .040 over with exhaust intake cam and head upgrades won’t be over doing it? What’s a realistic speed to get out of this hull? I mean ball park figure?
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Old 06-29-2021, 06:44 AM
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Many stories on the 454/alpha combo over the years, but mercury only offered that ONE year from what I read?
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Old 06-29-2021, 05:28 PM
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Originally Posted by Force235 View Post
So a mild 454 like .040 over with exhaust intake cam and head upgrades won’t be over doing it? What’s a realistic speed to get out of this hull? I mean ball park figure?
If I remember correctly, the 235 is a fairly heavy boat, well over 4,000 pounds. Running a 1.50:1 ratio(?) outdrive and a 21" - 22" prop should be do-able, in the high 40s to low 50s I would think.
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Old 06-29-2021, 10:00 PM
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I think he'll do a little better than that.
My son is plagued with a 454 big block/Alpha combo. In an 87 Force 265, Spinning a 19 pitch (unknown prop off the top of my head, it's no Mercury though) 3 blade to 48 to 50ish GPS.
Uncertain of drive ratio.
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Old 06-29-2021, 11:09 PM
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Originally Posted by cheech View Post
I think he'll do a little better than that.
My son is plagued with a 454 big block/Alpha combo. In an 87 Force 265, Spinning a 19 pitch (unknown prop off the top of my head, it's no Mercury though) 3 blade to 48 to 50ish GPS.
Uncertain of drive ratio.
I have a 19” 3 blade Mirage Plus 23 pitch and 21pitch.
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