Another nice aspect of the Brodix LH heads is the valve angle. "The valve is at a 17-degree angle in relationship to the bore or piston travel," said Neugent. The stock 5.0-liter heads feature a 20-degree valve angle, and Brodix stood the valves up by 3 degrees to help the air and fuel distribution. But Neugent cautioned that it isn't as simple as just moving the valve angle in the head. The port locations are also critical in distributing the air and fuel into the combustion chamber.
The guys at JPC Racing bolted the heads back on with a few extra parts and pieces needed for the installation. Cometic provided its MLS (multi-layer steel) head gaskets, and a set of replacement intake and exhaust gaskets. The heads were secured to the Boss 302 block with ARP 1/2-inch studs, which we procured from Summit Racing. Comp Cams came through with a set of its 1.6 roller rocker arms and new pushrods.
The swap was straightforward, and before we knew it, the car was back on the dyno. The new heads helped the engine breath easier, and Burcham dialed in the tune using a DiabloSport chip in the stock A9L computer. The result was a better 508 rwhp at 6,400 rpm and torque of 425 lb-ft. The better flowing heads helped feed the hungry 331ci, and also showed that better flowing heads also make a difference in a supercharged application.