Just got a bunch of test results through from Craig, he spent a couple of days on the dyno back to backing his early head intakes against the Torker & Performer.
The motor the testing was done on was:
355, TP CNC -3 heads, 248 @ .050" roller cam, 10.5:1 comp - strong street/strip engine that'd be at home in traffic or on the strip.
The 248 @ .050" cam was chosen as it bridges the gap between Dual plane & single plane territory - getting fairly large for a dual, a little small for a single, so it should give both types the opportunity to perform.
All intakes were match ported, but no other work done.
There were a couple of suprises in the mix, with the Torker losing to everything, even the performer!
Torker ------------ 436.3 ft/lb @ 4800rpm, 455.4hp @ 6300rpm.
Performer --------- 451.1 ft/lbs @ 4450rpm, 471.8hp @ 6250rpm
TP High rise dual --- 477.4 ft/lbs @ 4900rpm, 528.6hp @ 6700rpm
TP High rise single - 481.4 ft/lbs @ 4700rpm, 536.2hp @ 6550rpm
Pretty safe to say the TP dual will work best with cams under mid 240's, anything above that would be better off with the TP single.
I suspect the difference would be the other way between the TP dual & single if the heads were iron HQ's or basic -3's, the heads would be choking it before 6000rpm, so you'd use a smaller cam & the TP dual, with very good -3's it'd be the TP single & big cam all the way.
When Craig told me the Performer beat the Torker everywhere it took a while to believe him - who woulda thunk it?
Anyway, you wanted engine dyno proof, you got it, TP dual beat the Torker by 40ft/lbs & 73hp.
The real story is in the shape of the power & torque curves (sorry about the quality of the sheets - fax is teh suck, will get higher quality sheets soon):
TP dual v's performer:
TP dual v's torker:
TP single v's torker: