When installing these plugs into the heads I coat mine with a bit of cooper coat to prevent galling. Like mentioned the crush washer has to crush which will seat the plug. Tighten then up a bit. I use to run the Auto lite in my KRE heads, but I like the NGK plugs. R5671A-7
https://www.ngk.com/ngk-4091-r5671a-7-racing-plug
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68 Firebird. IA2 block, 505 cu in, SD Performance E-head, Solid roller 3600 weight. Reid TH400 3:90 gear. 28" slick.
Best so far 9.95@135 mph. 1.39 60 ft.
76 Trans am, TKX .81 o/d, 3.73 Moser rearend,
468 with KRE D-ports, Doug headers, 3" Exhaust
950 Quickfuel.
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