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Iridium plug heat range?

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maxsideburn

15+ Year Contributor
35
0
Jul 13, 2005
Lafayette, Louisiana
The friend I got the car from warned me to only use Iridium plugs from Buschur Racing because the ones at most autoparts stores had incorrect heat ranges and that one time he used them and found the exhaust manifold glowing when he popped the hood.

Well Buschur Racing no longer seems to have them. So how do I know what the correct heat range is? My buddy claimed to notice a real difference with the Iridium plugs and I'd like to give them a try.
 
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