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302/311 SR1 with Small Blocks and Alpha drives.

Old 01-12-2023, 07:29 PM
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Originally Posted by cheech View Post
Are you looking to repower an existing boat that has Alphas already?
Not me, but we were talking about the 6.2 litre as a replacement for the 7.4. He never mentioned changing the drives . Didn't the factory put 330's in front of Alphas ? I was wondering if the factory had ever used a Small block / Alpha combo in the 302/311 boats. There is only 3 mph difference in a 272 SR1 between the small block package vs 7.4 Bravo's
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Old 01-13-2023, 08:22 AM
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I think the big block Alpha deal was just for one year. The 6.2 would be a decent replacement for the 330, but if (when) you want more, it's going to be difficult.
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Old 01-13-2023, 10:51 AM
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Originally Posted by bunky1957 View Post
Not me, but we were talking about the 6.2 litre as a replacement for the 7.4. He never mentioned changing the drives . Didn't the factory put 330's in front of Alphas ? I was wondering if the factory had ever used a Small block / Alpha combo in the 302/311 boats. There is only 3 mph difference in a 272 SR1 between the small block package vs 7.4 Bravo's
Yes there were 330's in front of Alphas. As to years with boats there could be any weird situation.
But seems there are a lot of 1987 Bajas with 454/330 Alpha combos. 1988 was first year for Bravo AFAIK.

Originally Posted by resurrected View Post
I think the big block Alpha deal was just for one year. The 6.2 would be a decent replacement for the 330, but if (when) you want more, it's going to be difficult.
Well if one wanted to pay and play the original Mercury as some do.
And to be a Guinea pig, they just released these that were discussed on here.
400HP VS 350HP of the 6.2's. Probably more torque also as it has a 4" stroke crank.
Mercury 409 MPI
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Old 01-19-2023, 08:23 AM
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Originally Posted by bunky1957 View Post
Not me, but we were talking about the 6.2 litre as a replacement for the 7.4. He never mentioned changing the drives . Didn't the factory put 330's in front of Alphas ? I was wondering if the factory had ever used a Small block / Alpha combo in the 302/311 boats. There is only 3 mph difference in a 272 SR1 between the small block package vs 7.4 Bravo's
I had a 272 sr1 1988 with twin factory 320 efi 5.7 small blocks and bravo drives 1.5 ratio. It was faster than the 330 big block equipped ones. by about 5mph. And it was much quicker. I attribute this to the efi efficiency, the higher wot rpm and the much lighter weight. The 320 efi I had came from the factory with aluminum efi intake, aluminum eddie marine manifolds and risers.
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Old 01-27-2023, 07:18 AM
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Originally Posted by j272 View Post
I had a 272 sr1 1988 with twin factory 320 efi 5.7 small blocks and bravo drives 1.5 ratio. It was faster than the 330 big block equipped ones. by about 5mph. And it was much quicker. I attribute this to the efi efficiency, the higher wot rpm and the much lighter weight. The 320 efi I had came from the factory with aluminum efi intake, aluminum eddie marine manifolds and risers.
The 330/Bravo 272 SR1 boats were very back heavy and would run about 61/62 mph. That hull is better suited to a lighter engine/drive combo.

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Old 01-27-2023, 08:14 AM
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Originally Posted by bunky1957 View Post
The 330/Bravo 272 SR1 boats were very back heavy and would run about 61/62 mph. That hull is better suited to a lighter engine/drive combo.
Yes, my small blocks would push it to would run 68 mph gps, 72mph pitot speedo at 5400 rpm w/mirage plus 23's (had nose cones too, not sure if that helped)

1988 sr1 272 w/ 320 efis
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Old 01-27-2023, 08:16 AM
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double post sorry


Last edited by j272; 01-27-2023 at 08:39 AM.
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