you dont have to do anything to the internals to run a supercharger. i had one on my 99 ta with an ls1 and it was fine. i had to take it and tune it in detroit but thats all. its no big deal to supercharge a car. and if i were to supercharge a 427 i would get more power out of it that the 600 they plan on gettting out of the blue devil. after market superchargers normally give you about 40 to 50 percent more hp. that 427 would probably get about 650 to 675 at the wheels.
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