6066 (1960-1966) GMC Truck Club - Spark Plugs for HEI Fired 351

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- - Spark Plugs for HEI Fired 351 (https://6066gmcclub.com/showthread.php?t=51813)

5Tractorguy

March 24th, 2025 11:48 PM

Spark Plugs for HEI Fired 351

1 Attachment(s)

Those of you who are running the HEI conversion, what do you recommend for plugs?

1961 351 V6 with the Buick HEI Dist. conversion. I'll be servicing the truck this spring and didn't know if I should run the stock plugs again, or change to a different plug.

I currently have short reach plugs, compression washer (not tapered). I'm putting together a stock order from Rock and wondered if any of these are preferred over others.

Attachment 11106

bigblockv6

March 25th, 2025 01:32 AM

Re: Spark Plugs for HEI Fired 351

The AC R44XLS6 is specifically an HEI plug which accepts .060 gap and is a long reach plug compatible with the GMC V6. Pete

lizziemeister'sV6

March 25th, 2025 12:02 PM

Re: Spark Plugs for HEI Fired 351

Quote:

Originally Posted by bigblockv6 (Post 78738)

The AC R44XLS6 is specifically an HEI plug which accepts .060 gap and is a long reach plug compatible with the GMC V6. Pete

Good to hear from you again Pete!

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