Determining Correct Plug Gap

Q: Determining Correct Plug Gap

For those of you who made the conversion from the stock heads to a set of 6x’s – What plug gap do you use now?? Since GM went to the HEI when these heads were used, I would guess that the plug gap should be .055 – .060″[?].

A: You gap the plugs to correspond with the ignition you are using, not the head castings. If were running a points distributor, you gap the plugs according to the typical points gap of .040. If HEI, use the HEI .055 gap.

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