650 on a 460
Laughing Gas
Joined: Apr 2003
Posts: 837
Likes: 2
From: Minnesota
Depending on how you use the truck the it should be more than adequate for towing and general use.
My Carb Guy was talking about dropping me down to a 570 cfm Street Avenger if my OE 4180 gave me any more problems. So far it hasn't.
I tow a 10,000# fifth wheel and then general utility use as a pickup. I seldom see >4,000 rpm and a lower flow rate is better for torque and mileage at lower rpms.
My Carb Guy was talking about dropping me down to a 570 cfm Street Avenger if my OE 4180 gave me any more problems. So far it hasn't.
I tow a 10,000# fifth wheel and then general utility use as a pickup. I seldom see >4,000 rpm and a lower flow rate is better for torque and mileage at lower rpms.
