about to upgrade my spark plugs...first of all, which ones are best? i have used bosch platinum 4'* before with GREAT sucess...but i'm open to anything...second, what should i drop the heat rating down to? (colder plug). thanks for your help!

mr. bean

I ran the +4'* for about 15,000 miles with great success also. I know a lot of people had problems with them. This time around I desided to go with the NGK Iridium IX plugs. I don't know if it is just because they are new plugs or because of the design but I think I have a bit more mid power. So far they are great and it is what mostly everybody else will recommend. Either NGK or AC Delco.

Ditto! Don't worry about dropping heat ranges unless you're seriously hopped up. We only have about 5 cars here that need to drop.

i'd say just run the recommended ac delcos

MSD suggests copper wire for there system and strongly suggests staying away from platinum.

If you truly want the best plug and you are running NOS go Denso plugs.


If you just have to mess with it MSD suggested up to a 2 degree change but to stay with copper. If you dont like what you hear/see talk to MSD.

Ty

thanks a bunch. i'll be checking out the NGK'*...so what exactly is the "downside" of going with a "cold" plug...dad and i were talking about it the other day and neither of us could remember exactly how the "heat range" in plugs works...and what it means...any help from all you nuts would be great!

mr. bean

I ran the ac delco rapid fire, they worked great.