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spark plug

Started by q8charger, April 13, 2019, 09:54:01 AM

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q8charger

Hello,

What is the best spark plug  for factory heads 1977 big block  440 ?  I want part number please.

Thanks

b5blue

NGK was good but heat range depends on your build.  :scratchchin:

Just 6T9 CHGR

Chris' '69 Charger R/T


69wannabe

Up to 8.5 to 1 should be an XR 4 and from 8.5 to 9.5 to 1 should be an XR 5.