Quote:
Originally Posted by Scott65
That would be good info. I actually think there are several versions of the same heat range, and physical dimensions. At least at one time there were. Different suffix could get you a different gap etc. Mine (BKR6E) come at slightly under or right at .030 gap. But there was one that came with either .040 or .045 gap that had a -11 suffix I think. (Fuzzy memory) There's possibly been some downsizing of variants. I don't mind opening the gap from .030. With my coil per cylinder arrangement, I just put them in where they were factory gapped. HEI or MSD could use .045 instead. The 6 heat range is supposed to be a step colder than the 3924 Autolite, or 12yc Champion. They stay cleaner in my opinion than the 3924 Autolite I ran for many years, even though they're colder. They're easier to read the heat range on due to their material being a lighter color. The strap coloring looks good on mine with 10.4 compression and aluminum heads. As always results will vary...
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-11 marked NGK is 1.1mm gap.
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1968 Firebird 400 RAII M21, 3.31 12 bolt, Mayfair Maize.
1977 Trans Am W72 400, TH350, 3.23 T Top
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