well i re gaped the plugs to .35 and i have 0 knock the entire pull. talked to the actual builder of the car today (guy before one i got it from) he helped alot. its a 2.76 pulley smallest he said they had. and he ran a 12.3 in the 1.4th with that . so now i got no knock im going to take it to dyno and track and see whats truly going on