My Vega’s been running a bit crappy so I thought I’d try changing the plugs out. Basic specs are: 383 stroker, 671 blower, dual Holley 750 blower carbs, isky blower cam, msd ignitioin. Motor is not hi-compression, revs are kept under 6k and blower is putting out around 4-6 lbs. Car is mainly driven as a cruiser with the odd trip to “Mexico”. Motor tends to run on the hotter side. Current plugs are Autolite 3924-gapped at .040”. I did a bit of research and found few sites recommending Autolite 3910x plugs—these are classed as race plugs, would they be too much for a street car? Can someone recommend a better plug and what to gap it at?
