67 twin turbo dart

Matts440 said

Ordered one, will be here tomorrow supposedly. I do have some colder NGK plugs I can put in, I got them for the higher boost application.

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I order NGK plugs from Rock Auto in bulk. The colder ones will be more likely to fuel foul if the tune is fat. I run a 6 heat range on the street and 8 at the track. I just got some 5s to try this year with 87 octane.