Chrysler’s B and RB engines are capable of making monstrous amounts of horsepower with the right components. Now big block Mopar fans can get the airflow they need with a set of Trick Flow PowerPort 240 aluminum cylinder heads. Dyno-tested on Trick Flow’s Superflow dyno, a 10.4:1 compression, 446 cubic inch Mopar with PowerPort 240s made 620 horsepower at 6,200 rpm and 570 lbs.-ft. of torque at 5,000 rpm.
The PowerPort 240 heads feature fully profiled 78cc combustion chambers and CNC Street Ported 240cc intake/74cc exhaust runners for balanced airflow from runner to runner. Trick Flow engineers fixed the shortcomings of the factory head design by relocating the oil holes for the rocker shafts and optimizing the shape of the runners to increase airflow velocity and add much needed strength to the rocker arms shaft bosses.
The PowerPort 240 heads are available with your choice of three valve spring packages:
• 1.460 inch dual springs rated to .650 inch of valve lift
• 1.500 inch dual springs rated to .680 inch of valve lift
• 1.560 inch dual springs rated to .700 inch of valve lift
The Trick Flow PowerPort 240 Cylinder Heads are machined to clear 3/8 inch pushrods and accommodate all factory-style big block pistons, roller rocker arms, intake manifolds, and headers. The heads are fully assembled with valves, valve springs, seals, locks and retainers.