Join Date: Dec 1999
Location: Big D little a-l-l-a-s
Good Advice 427,
My suggestion would be to go with a centrifical supercharger like an ATI. The Blower does look trick but a centrifical is much more efficient and by using an intercooler it will generate less heat than a roots blower setup. You could run higher compression with this setup compared to a blower setup. If you stayed in the 9-9.5 to 1 compression range (MAX) with aluminum heads you could safely run say 8 lbs. of boast for a 30-40% increase over the normally aspirated motor. This would turn a fairly mild 350 horse motor into a 475 horse motor and because you don't have to run 7.5-8 to 1 compression, it would still run good before the boast start to kick in (usually around 2500 RPM).
NOTE: I would not try this without forged pistons. If you have cast iron heads I would stay in the 8.5 to 9 to 1 compression range as a MAX. A good head seal is vital in this case (FELPRO gaskets and block studs are a good idea). The studs are PROBABLY a little overkill at 8 lbs. of boast but I always play it a little safe in this area.
If you go crazy on the boast, you are going to need a sronger bottom end, o-ringed cylinder bores, etc.