Just put Bosh Plats in a month ago and my owners manual says .45". Looking through my Chiltons Maunual the other day and it says to gap them at .35". Why the diff. This is for an 88 GTA 5.7. By the way, should I have stayed with ACs. The Bosh seemed to work fine in the 86LG4, however they dont seem to preform as well in the TPI.

 

The Bosch plugs suck for GM HEI. Get a decent set of AC Delcos and gap them at .45 if you have an aftermarket coil or .35 if its stock.
Rapidfires are the best. They are pregapped and they are trhe best plugs I've ever used.
Part #2 for the rapidfires.

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Trevor Myhre
91 Firebird Formula-
Built 355 w/ ATI ProCharger P600B 12psi, 2 core intercooler.
Pro-Built Stage 3 700-R4 w/ Continental 2400 stall TC
C5 wheels and tires.

92 Firebird Convertible-
TBI 305 w/ L98 cam, MSD 6A, Open Element, Free mods
700-R4
WS6 wheels and tires.

Me, my car and I
"Speed kills but it makes me feel alive" - White Zombie
Crazy street-racing idiot member of the All-Powerful Nor-Cal crew.