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The data you collected is all accurate, how you inturpret it in the car is another.
There is a big crutch with this package for high Horsepower and it is the Belt drive system.
A 10 rib drive is the best way to get you where you want to be but then you have to deal with the restrictions in the the blower manifold and intercooler.
Most all of the testing data does not include the blower manifold with intercooler.
It is obvious that the larger blowers will perform better and carry the power to the finish line.
Making power for 4 seconds is different then making power for 9 seconds we see this all the time
Take a lesson from GM they put a 4.0 blower on a 327 in the COPO and made 1200 HP.
Going up on cubic inch is effectively the same as putting a smaller blower on your 376 and trying to make the same power.
If you looking to do a 416 go to a whipple 4.0 or YSI and take advantage of it.
There is a term I use often when talking about turning blowers faster, Diminishing Returns!
The faster you spin the blower the More HP it takes to turn it and the More Heat it makes.
Ted.
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