You can have 500 hp, but how much money do you want to spend & how much reliability do you want to sacrifice. After my 390 died & I wanted a 500+ hp motor I bought a 428 SCJ block which will be stroked to around 456 cid. The Edelbrock performer RPM heads will be fitted & a 950 Holley carb. The cam will be a custom grind to put the HP & torque exactly where I want them. The motor is being built by a professional who has guaranteed 530 hp minimum. The price is about $11,000 but it will give me the reliability & performance I want.
If you really want 500 hp out of a 390 try talking to the Edelbrock people or someone like Keith Craft from Keith Craft Racing or maybe someone on this forum has more ideas, I am in Australia so things are a bit different here
Regards
David
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