From my experience in working in an auto parts store i would have to say a really good plug to use would be Denso plugs i am guessing they are really good cause the price of them was outrageous at 22.99/each

 

Price doesn't always equal good. Why spend $23 a plug when everyone is doing fine with a $1.50 plug?

 

Thanks for this thread, I have an s/c and plan on a few mods... was wondering about plugs... Now i know... how about thermostat? do you have to change that as well??

I just plan on a CAI, and a SLP exhaust for now... but later on, do plan on headers (SLP) and whatever mods it takes to run a 3.5 or 3.4 pulley... and will include a recalibrated PCM, but again, that's in the future...

 

You don't HAVE to change your t-stat, but running a cooler one will assist with KR at operating temperature. Personally, I'm running a 180* t-stat.

 

Im running the TR-6 plugs from NGK. found them to be the best for me. for some reason, my car was misfiring pretty bad with the autolites. I used to run 22* timing, but i backed it off to 18 now and run a smaller pulley. runs great. only get about 2-4 KR when i first get on it, then drops to zero.

 

not trying to steal the thread but i figured id bring up something i was wondering and maybe a few others too. whats with the e3 plugs. do they work like they should and increase engine life, more power, less emissions, etc?
figured id ask since bumpin seemed to know what hes talking about on this subject..lol
http://www.e3sparkplugs.com/

 

Well, not only E3 plugs, but what about Pulsar plugs? They claim a lot of outragious increases as well, including MPG, HP and so on... I had posted the question on a previous thread, and it was said that there is NO way a spark plug can increase HP, but what can it do for MPG?