I just looked at NHRA specs ...

68 piston .021 ABOVE the deck for both the 290(2bbl), 300, 330 and 335HP

69 Piston .021 ABOVE the deck for the 290(2bbl), 330, and 335HP

70 is .004 in the hole rated at 9.5 compression and 335 HP

71 is .019 in the hole rated at 300 HP


Last edited by Johnrr; 10/01/08 08:36 AM.