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spark plug

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

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q8charger

April 13, 2019, 09:54:01 AM
Hello,

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

Thanks

b5blue

#1
April 13, 2019, 10:57:35 AM
NGK was good but heat range depends on your build.  :scratchchin:

Just 6T9 CHGR

#2
April 16, 2019, 05:25:02 PM
NGK XR5 
Chris' '69 Charger R/T

69wannabe

#3
April 17, 2019, 08:58:50 PM
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.
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