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VintageMusclecar · #1 02-22-2016, 12:33 AM

The reasoning behind the big gaps "back in the day" was to create a bigger flame kernel to try to light off the ultra-lean mixtures they employed back then to get them past the smog sniffer.

I've never had a problem running .035" gaps with an HEI, that's what I'm running with my 357 small block in the Malibu wagon. I don't think you'll have any issues if you're willing to give it a try.

FWIW.

**njsteve** · #2 02-22-2016, 12:55 AM

Oh, if that's the case, I do have an extra set of the .040 gapped NGK UR4 and UR4GP which is the factory heat range for the '72 455HO engines. But that might be too hot of a heat range I imagine?

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