J Heads

actually I talked to the tech guy at Kb and he recomended it, And I have seen dyno results that prove it- not an instant gain but over time if the engine with the bigger 2nd gap is redynoed it will be closer to the same power than the one with the smaller 2nd gap. its more of a endurance issue- I started doing it on stock car motors and now they tell all thier friends to have me build their engines.