![]() both are turned OUT 1 turn to get a maximum vacuum of 12-13 inches. marked, pulled & inspected plugs, the lower side (closest to piston) is a white/vanillaish clean color.however, the top side (closest to valves) is dark, black, wettish color. ![]() changed spark plugs from AC 43 - the NGK's did seem to do better, also bumped gap UP to 45.lowered timing, seem to make it worse so i put it back.4- speed tranny, manual Disc brakes, 160 thermostat, 1 5/8" Headers. I ONLY run BP 93 & Car starts great, hot or cold and i don't have any pinging at high rpm. is running the 18 degree bushing with light blue springs & 16 initial timing to put me 34 total and all in around 2800-3000 rpm. (NO Vacuum Adv.) Blaster 2 coil, NGK V-power xr5 spark plugs (heat range 5) gapped to 45 per MSD. Specs - 1968 327 with 461 heads, TRW Forged Flat tops, Crane 284 cam, set 4 degree advanced with 1.60 roller tip rockers, NEW 600 Holley Carb, with MSD 6A, Pro Billet 85551 dist. It doesn't do it all the time and sometimes you have to really feel for it. Working on my 56 BA & I'm trying to eliminate a "slight" intermittent miss / stutter while cruising 55mph 2100 rpm and would like your input.
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