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| GMC V6 and V12 Engines Engine repair and rebuilding |
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#1
March 24th, 2025, 11:48 PM
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Spark Plugs for HEI Fired 351
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. Screen Shot 2025-03-24 at 6.51.16 PM.png 
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#2
March 25th, 2025, 01:32 AM
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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
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#3
March 25th, 2025, 12:02 PM
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Re: Spark Plugs for HEI Fired 351
Quote:
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