Plug gap is dependant on cylinder pressure/voltage , those cut-back plugs are/were 'marketed' for high HP motors running high cylinder pressures , hence the tighter gap.............some guys on here running NGKs will be pulling em out & cutting the straps back , will also go through two sets of cut-backs to one set of standard type plugs...........maybe the cut-backs worked better in you're application due to problems elsewhere , might not gain in every application , the NGK 'V' series plug definatly did'nt help regards my combo.

With respect.