Pros/Cons 383 vs. 454
Ok guys I'm in the process of deciding what I will use to power my next and hopefully final project.
It's a 1985 Scorpion 24' that weighs approx. 4500 - 4700 with engine, drive, fuel etc. It currently is set up with a 454 400 cyclone and TRS. Core Requirements: 75 mph and as reliable as possible.:rolleyes: :D I want to know what would you do? I'm thinking a mean 383 or do I go 454 or 502? Give me all your input. Please pass the popcorn. :evilb: |
There is no substitute for cubic inches.
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You will get more bang for your buck with the big block. But I am in the process of installing two 383 MPI's in my 23' Formula. I am a small block guy at heart..... comes from many years of oval racing.
There's no replacement for displacement..... except for RPM and airflow. A 8000 RPM small block aint gonna work in a boat, so you have to supercharge it to get that kind of power. |
Cuda beat me to it. I'd go 502. BOB
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Ok.. Ok.. cubes it must be then.
I knew there was a reason those GM crate 502's kept on looking at me..! |
basicaly it comes down to power to weight. to move weight you need torque and that will only come from cubes. reliably anyway's. small blocks are great for say a 22 velocity or donzi. but i would think a 500 or 525 would do it with great resale and reliability.
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My 502 MPI Mag ... 500 EFI cam ...Crane Roller Rockers ...good exhaust ...= ~ 500hp .....
The Square Root of (Total Shaft Horsepower / Weight ) x Constant = Speed Square Root of (500/ 4700 ) x 250 = 82 mph Drop it in .. turn key ... go ..... 7000.00 delivered ....:D |
Last year I built a 383 that should put out 400Hp (no dyno #'s but a extremely similar build put out more with worse heads)
However, I have more $ into than a crate 502 Just like offthefront says. |
Originally Posted by offthefront
(Post 2098267)
My 502 MPI Mag ... 500 EFI cam ...Crane Roller Rockers ...good exhaust ...= ~ 500hp .....
The Square Root of (Total Shaft Horsepower / Weight ) x Constant = Speed Square Root of (500/ 4700 ) x 250 = 82 mph Drop it in .. turn key ... go ..... 7000.00 delivered ....:D Is there something missing in your formula? EDIT: OK, square root of the function (500/4700). I guess that's why the parenthses! Duh! |
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