M1 SP vs Air Gap

Each combo needs to be tuned for best comparisons, and it's not easy because of all the possible variables involved, particularly weather. For my particular combo, I found the Holley Strip Dominator to be faster than the Weiand Stealth - both with the same Holley 750 double pumper and 1" tapered 4-hole spacer. The dual plane ran best when the deeper side plenum jets were 2 #'s bigger than the shallower side. I accidently stumbled across the idea when I happen to notice that the cylinders/plugs fed by the deeper side plenum 1/2 were colored lighter than the shallower 1/2!

The jetting for either intake was a bit leaner after I installed a TTI 3" X-pipe & Dynomax Ultraflo mufflers.