a 600 is too big for a stock 318, la or poly, as they were built for our trucks. lots of guys run them, do your homework, you'll see the 500, (actually 460) cfm is perfect for the 318 in the operating range a stock engine is designed for. from my experience, they run cleaner, stronger, and are more responsive with the 500 over a 600-650.
im stating this from memory, so pardon any minor fl
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Dodge Sweptline Truck General Discussion