I know a lot of SO CA racers that insist that running the tapered 4150 to 4500 carb adapter is faster at the track than using a 4500 intake with a 4500 carb. bolted onto it shruggy Me thinks the added volume of the spacer may be worth some gain, how much I do not know shruggy
I haven't done a A, B, A test at the track either so confused work
I have dyno tested a Wilson 1.5 inch thick reversion spacer on a Studka brand dyno in Madras years ago and it was worth 8 HP at 6500 RPM on my old pump gas stroker motor out of my Duster shruggy

Last edited by Cab_Burge; 12/22/22 06:45 PM.
Mr.Cab Racing and winning with Mopars since 1964. (Old F--t, Huh)