Originally Posted by lmsport
Go with 383, always makes more power. Keep compression below 8:1.
Vortec heads are out. Get some Iron Eagles, 200irv, big chamber.
280rv cam is out, get a custom ground turbo cam from isky.
No need to turn over 6500.
Figure about 125hp per 5psi of boost up to 15psi, plus the hp of the engine without boost. You will need intercooler and maybe alcohol injection.
As bad*** as that sounds, Im dropping the turbo setup and leaving that for my smaller motors. Also you are not gaining 125hp off of 5 psi. At 5 psi of boost your only adding about 20-30% more hp off your initial block power at best. So say you got a 400 horse motor that you want to run 5 psi at, say your getting a 25% hp gain out of that 5 psi your hitting 500 horse now. Atmospheric pressure is 1 bar (14.7psi), so if you were to run 14.7 psi of boost you would have twice as much pressure in the chamber as compared to no boost, therefore your hp gain would be doubled. 400 horse turns into 800..
Thats why the most common psi used in boosting is 7-8, at 7-8 your getting a 50%+hp gain on a good build. At least thats how all my prior experiences in the past have been with import motors.