I have a TorkerII 340 or 360 and went to the RPM Air-Gap. I notice a big bottom end increase. His current Torker has straighter runners and a possible shallower plenum.
i have curently the summit rpm air gap stage 3, wich i think professional products makes it, so i think mine has very close to same results.its a 340 ,solid cam 244/252 @o50 520/540 lift, 4.11 suregrip, 3500 stall, 750 hp holley, x heads, 2.02 /1.6 ported, really dont want to twist it past 6800-7000 . street car. 1.6 ratio rockers are next and 3 inch exhaust.
I agree. When Ed Hamberger had his For 340's Only shop, he told me the manifold was junk. He told me the stock manifold put out more horse. This was the old Torker 340 manifold.