Quote Originally Posted by bluegtp91 View Post
Yeah for that small of a pulley setup I'd get 103's...gapped at .050...I ran my 103's at about .052, even at one point I was running them out to .055...so it all depends what you can get away with...or you can get a MSD Ignition setup like Reptile...and I think his plugs are gapped something crazy like .065 or .070 if I remember right...
.075.....so you're close.

Here's how to tell if you need to run a cooler plug....look at the porcelain end, and if it looks bleached white, then you have too hot a plug, and you need to step down to the 103's....if they look sooty, then you don't want to go with a colder plug.

This site here will give you a decent general idea of how to read spark plugs....although you can google "reading spark plugs" and it will pull up a great deal of info.

Spark Plugs

NGK Spark Plugs USA
The point of all of this is to make sure that your plug isn't on the verge of fouling out, hence the importance of the heat range. KR will play an important factor in the heat range as well, but if you're not seeing any now, then you should be good. Gap them as far as you can until you're getting misfires, then close the gap back down a couple thousands. Once you get that set, then start bumping up your timing. Of course, the draw back of dropping pulley sizes is that you end up having to lower your timing like you have. I think you're on the right track though.