Plug readers

MomsDuster said
It has MSD pro billet with streetfire box. 20* at idle and 34* all in at 3000.

440 with 915 heads mild porting and polished chambers.

Which plugs looked better? There are two different heat ranges there. First set of pics cooler plugs.

I do have a 10* bushing that I could theoretically get 24* initial with a total of 34* or I maybe I could speed up the curve a bit to get some in sooner?
And btw there were no WOT runs in this cruise.
(Was with the wife) :lol:

The second set looks like the correct heat range, or the closer of the two.

With that ignition, you should have a dull white on the porcelain so you have room to clean up the idle circuit and cruise too.

I’m older than dirt, so remind me what carb this is.