Repower with 8.2L

Rochin · Post by **Rochin** » Tue Jul 12, 2005 7:00 am

Hello I have a 1986 33 Convertible. I want to repower with 8.2L Carb. My current engines are 454 340HP Carb. Anyone have this or simmilar engines, can give me the numbers of cruisse kt@rpm and props. My trans are 1.9. Thanks Rochin

photo finish · Post by **photo finish** » Tue Jul 12, 2005 7:09 am

Rochin, I repowered with 8.1l you can check out the info under convertibles forum "tim's repower".I have not seen any results with the 8.2l Tim Stamm Photo Finish 1981 33' Bertram FBC

Post by **dougl33** » Tue Jul 12, 2005 7:42 am

I've been wondering that myself. Will the intakes, carbs, etc... from our 454's fit a 502 longblock? I actually have the same exact boat that you do. There had been a convertable on yachtworld for awhile that had 502's but its been gone now for some time. To answer your original question, I don't belive that anyone on this site has the 502's. There are a couple of guys that have re-powered with the 496's, but other than that all of the gas guys have 454's. Regards, Doug L. 1986 33 Bertram FBC Queen Elizabeth Marblehead, MA

Rochin · Post by **Rochin** » Tue Jul 12, 2005 8:49 am

Tim Your ratio is 1.9? Doug My plan is buy only the short blocks and use spacers for the intake. This block add 1 inch heigth, maybe they fitt. Rochin

Post by **dougl33** » Tue Jul 12, 2005 9:16 am

Rochin, I was not under the impression that the 7.4L heads would fit the 8.2L. I thought I had read that the 7.4's had oval ports while the 8.2's had rectangular. Why not just go with long blocks? FYI: Tim is running 2:1's on his 8.1's. Regards, Doug L. 1986 33 Bertram FBC Queen Elizabeth Marblehead, MA

Rochin · Post by **Rochin** » Tue Jul 12, 2005 10:32 am

Doug The rectangular ports make more HP than the large oval at over 4500 rpm.They breath more air. The oval make more torque than rectangular at lower rpm (3000 to 3400). They fit to any BB from 427 to 502. I think have more torque at the same rpm let me use a bigger prop with better fuel economy and speed. Rochin

photo finish · Post by **photo finish** » Wed Jul 13, 2005 2:50 am

yes i went from 1.9 to 2.0 gears i would guess the 502s would gobble some gas.... Tim Stamm Photo Finish 1981 33' Bertram FBC

Post by **Admin** » Wed Jul 13, 2005 5:16 am

Especially carbed. I wonder if Rochin could get this set up with EFI? David Sumich 33 Megabites Huntington Harbour, CA Forum Administrator

Bompapen · Post by **Bompapen** » Wed Jul 13, 2005 5:59 am

EFI That be great for fuel economy more Torque and HP,I preffer carbs, they resist more corrosion less trouble and I can have one spare, changing very easy. If make the repower I let you know the numbers. Rochin

Rochin · Post by **Rochin** » Wed Jul 13, 2005 11:21 am

Bompapen You go to repower with 8.2L?

Rochin · Post by **Rochin** » Wed Jul 13, 2005 1:11 pm

Tim What HP are rated your 8.1L?

photo finish · Post by **photo finish** » Thu Jul 14, 2005 4:46 am

385hp Tim Stamm Photo Finish 1981 33' Bertram FBC