My 1993 Chevy suburban was running fine but I decided to change plugs, wires and cap just for fun. This was a stock system. To my surprise, the plug gap as found averaged OVER 0.060"! The center electrode was perfectly round. I installed the new stuff, plugs gapped at whatever factory spec, expecting to get better SOMETHING. Net result was zero MPG increase, no other discernable differences, either.

Your system should fire those plugs at 0.045" no problem. If you had all day at a deserted racetrack you could run several runs with plug gap opened each time to find out optimum. Probably won't happen, though.

R.