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The 440 Source Stealth heads ot the Edelbrock RPM heads will make 500+ HP and will accept stock intake, rocker gear, etc. The Edelbrock RPM heads do have angled spark plugs which interfear with some manifolds and headers, where the stealth heads have the spark plugs in the stock location.
The Victor heads flow really well and can make 600+ HP, but require special rocker arms that cost between $600-$1200 depending on which ones you buy. Also the heads do not come with valve springs, locks or spring seats which will add several more $$$. Plus they take a special valley tray that is about $50.

Anyhow, if you want to make alot of power get the Victors, but if you only need around 500 HP it will cost less to use the Stealth or RPM heads.




well said.