383 Mag Mpi Vs 454 Questions
03-22-2013, 10:45 AM
#1
383 Mag Mpi Vs 454 Questions
How much weight difference is there between the two?? How much do you guys think that weight difference makes on performance?? Anybody running the 383 that used to have the 454?? How much of a difference in mpg if any??
03-22-2013, 02:16 PM
#3
Registered
03-22-2013, 06:46 PM
#5
Registered
Based on this chart you can roughly figure 200 lbs per unit difference.
http://www.perfprotech.com/store/app...ower_Guide.pdf
Given very close power and torque numbers the 383 becomes the obvious choice. In the larger displacement big blocks 496/502 and beyond...there is very little if any weight gain but BIG power gains so in that arena for larger boats the Big Block wins hands down. I use 30' center line length and 8000 lb displacement as the breaking point where you favor the Big Block vs the Small Block.
If you consider what Ilmor has done with the 6.2 LS based platform...the line at 500~600 horsepower gets blurry. Beyond that the traditional Big Block Chevy architecture holds a decided advantage considering 'Bang for the Buck".
If I was considering say a 292 Formula step hull I would favor the SBC. In a 302 straight bottom i would have to go BBC.
http://www.perfprotech.com/store/app...ower_Guide.pdf
Given very close power and torque numbers the 383 becomes the obvious choice. In the larger displacement big blocks 496/502 and beyond...there is very little if any weight gain but BIG power gains so in that arena for larger boats the Big Block wins hands down. I use 30' center line length and 8000 lb displacement as the breaking point where you favor the Big Block vs the Small Block.
If you consider what Ilmor has done with the 6.2 LS based platform...the line at 500~600 horsepower gets blurry. Beyond that the traditional Big Block Chevy architecture holds a decided advantage considering 'Bang for the Buck".
If I was considering say a 292 Formula step hull I would favor the SBC. In a 302 straight bottom i would have to go BBC.
03-22-2013, 09:36 PM
#9
Registered
iTrader: (3)
Now in my little 22' resin bucket, If I wasn't getting ready to hang an eggbeater on it for 7, it would be getting a nice little 383 with alum heads a small whipple and intercooler and I would be fast enough to get myself in trouble real quick like.... but it would definitly be a blast.
