Spark Plug Question

I would also like to know.. I have the same situation and I'm wondering if I'm losing power... also, what if I go up a heat range to 26 plugs?!

I have run colder plugs in N/A applications and never noticed a difference. Please note that this was on carbed stuff (dieseling in the summer time was a reason for swapping down). I have to say that my uneducated (I havent seen this stuff tested on a dyno, for instance) gut feeling is that the gap will have a LOT more to do with it than the heat range. I have new 24's sitting on the workbench waiting to go in myself (I run 0.050" gap - gives me room for gap erosion and a possibly weak coil, etc, since I removed the MSD).

I would open that gap up if losing the bottle. And if pulling plugs anyhow, might as well swap back to 25's (though I think 24's would do fine, esp since we get the ping thing).

That just gives an outline of MHO.

Good luck Shawn.

You can raise the gap on the 24's & still be fine.

That's how I run mine (except side-gapped & indexed) & there's no difference in running 25's (which I ran last & they were side-gapped & indexed as well). So pretty much, I kept the factors the same except one was a 24 .... one was a 25. No difference.