NGK Racing Spark Plugs R5672A-8 Can these be gapped to .50-.54? 3 answers Answer this Question JEFF · 4 months ago YES I RUN MINE GAP AT 42 ON THE DYNO WE HAD THEM AT 55 AND KEPT CLOSING TILL MADE A DIFF. RUNNING THAT BIG GAP JUST PUTS MORE LOAD ON ROTOR AND CAP Help...