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Discussion Starter · #1 ·
They reccomend the autolite 3922's which seem to be just about unavailable as a starting point. I'd like to go with a colder plug . I'm assuming that would be the also unavailable 3921 or 3920. Anyone have any experience with other plug brands?
 

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You may want to look on ebay. There are a few sellers selling Nascar plugs and that number sounds about right.
 

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Discussion Starter · #3 ·
Don't know if I really want to by 80 of them but the price looks good enought that I just might.
 

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I recommend ngk R5671 A-9 or A-8...9 being colder than the 8.
If it's a small shot (125) then the 8 should be fine but needs to be checked...after the run inspect the ground strap and there will be a discoloration somewhere...if it's near the bend then it's the right heat range...if it's close to where it meets the plug base then it's too hot.
Brian
 
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