[Fast67VelleN2O]

I am extremely curious about what piston was used in this engine as well. In order to be a correct 11:1 compression ratio, you couldn't use standard closed chamber piston and an open chamber head to get this ratio. The only other piston at the time that would have been used was the L88 or ZL-1 piston, but even then, thats too much compression (12.5:1) and not a 396 piston. The factory would have had to make a special set of pistons for all of this to work correctly.