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Title: spark plug
Post by: q8charger on 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

Title: Re: spark plug
Post by: b5blue on April 13, 2019, 10:57:35 AM

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

Title: Re: spark plug
Post by: Just 6T9 CHGR on April 16, 2019, 05:25:02 PM

NGK XR5

Title: Re: spark plug
Post by: 69wannabe on 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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