BP filled the cylinders with custom-designed, forged-aluminum domed pistons from Ross, which ride on 7. Modified by BP, they flow 315 cfm and contain Ferrea valves and Comp Cams Pacaloy dual valvesprings, which control valve action of the solid-roller cam. The compression ratio calculates to 10. BP addressed that, supplying Gary with its blueprinted Pro-Series oil pump, a custom windage tray, and a modified Canton road-race oil pan that holds 8 quarts of Royal Purple XPR 10W-40 oil. A Modine oil cooler keeps the temperature in check and a Canton Accusump setup provides a pressurized reserve that pre-lubes the engine at startup and prevents bearing damage while deep in the turns.