The carburetor rules are very different depending on where you race your 602 & 604 crate engine.  We have specific dyno and race track proven 602 packages for the following rules:

4412 / 80583 500cfm 2bbl
4777 or 80541 650HP cfm 4bbl
or our custom Crate Engine 4BBL Carburetor

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This is a "clean sheet" carburetor that is highly modified and tailored for the 602 and 604 crate engines.  Designed for classes that do not have a specific carburetor part number in your crate motor rules

Prices on this crate carburetor start at $1400

Ryan Brown Performance Crate Motor Carburetor