60 Red Ragtop
Loc: Plano, TX
02-20-12 10:03 AM - Post#2192906
In response to technitom
Precious metal electrodes (iridium and platinum) last longer, so will maintain the proper gap for a much longer time. They have allowed new car mfrs to extend plug change recommendations to 100K miles. If platinum-tipped plugs cured a fouling problem, it's probably because they were a slightly hotter heat range.
I'm not sure what, if anything, copper core and Rapid Fire plugs do that other plugs can't. I guess a copper core could reduce resistance, allowing more spark current, but who knows if the performance increase is even measurable?
1982 C-10 SWB pickup -- Unmolested, original paint, 250 six, 3-on-the-tree
(Soon to be 350 w/Vortec heads & TH350)
Sold my 55 sedan in June 2014, having owned it 11 years.
Edited by MikeB on 02-20-12 10:05 AM. Reason for edit: No reason given.
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