Ok been a LONG while since I had mine running but specs are: Pontiac 400 10.7 cr, RA IV cam ,#62 heads (alot of work there) Torker 1 intake, MSD 7AL ignition (25+ yrs old) MSD 10mm cables. These heads use the gasket type plug. Again it's been a LONG time (probably 6 yrs since i did plug in this). Motor is locked up currently (3 yrs now .. ) I used to run #85 plugs gapped up to .110 ......yes BIG gap (PITA) but when i installed the MSD i was always lead to believe run as much gap as it will run....when it misses 1 time during trials...tighten back up by .010. That was about as big as I could get without killing the ground strap. Recently a friend and I were discussing this as he has a SBC (alot of SBC i might add) running a MSD 7AL (new digital stuff) as I asked him what he wanted me to gap his plugs at he said .045......??? My Poncho consistently moved my 80 TA (fully loaded) 0-91 (ish) MPH in 8.2 sec (1/8 mile times) shifting 6100-6200. (he's running more like 9.20's 140 mph 1/4 mile in a 2900 lb NOVA) Am I off here or missing something. ?