heres the question: im getting a new high output proform distributor and was going to replace the plugs when i get it . they are regular ac delco r45ts plugs. and was wondering with the incresed spark 50,000 volts! what should i gap my plugs at?? with the stock coil i gap them at 0.35" gap. the old distributor is stock vacumm adv. h.e.i. and the h.o proform is also the same type. the part# of the proform is# 778-66941r through jegs high performance.

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1989 firebird formula

Mods: converted from T.B.I. to a carburator 305 to a 350. Flowmater exhaust,hedman shortie hedders,202 160 (882) heads,.447/.447 lift 222@.050 duration speed pro 327/350hp cam 350 .40 over (356) edlebrock performer rpm intake and a 600 edlebrock manual choke (1405) Proform H.O. distributor slightly revised 700r-4

Future mods comp extreme energy roller cam, world products sportsman 2 heads, msd 6al ignition, billet distributor, blaster 2 coil and a 406 engine is in the works soon!!!!

 

I get maximum power with a .033 gap.
you will get fewer misfires with a tighter gap.