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Username Post: A education on Spark Plugs
technitom 
Contributor
Posts: 249
technitom
Age: 46
Loc: Near Cincinnati, OH
Reg: 12-01-11
02-19-12 03:42 PM - Post#2192552    

OK, first off I never have bought into the hype of those high dollar spark plugs...

On GM products I've always run AC Delco R type plugs... Now, just talking about AC Delco here..

what is the REAL difference between copper core, iridium, platinum, and rapidfire platinum plugs?

is one really any better than the other?

I kinda understand how plugs/coils and plugs/engine size/CR/ works, but I am curious...

should I first try to match a plug to the ignition source and plug wires, then adjust hotter/cooler for CR...

for example, I have a 77 GM HEI... for that year, most V8's call for a r44t or r45ts

but my engine is a 1984 bored out 305 with factory heads and the stock plug for it calls for a R43ts...

I plan to pull the plugs in there now and read them, as soon as I get a warm enough day. but I wanted to just understand the "science" behind the different plugs
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