What size and stall speed do you guys think i need behind my 12:1 572 Hemi street/strip deal? I have been running an 8" Dynamic 5400 stall behind my 511 12.5:1 wedge on the street without issue. I'm not afraid of stall speed and dont want to give up anything and drive it on the street. I have been told by a few that most under stall their Hemi's. Been told Hemi's n/a dont make the torque of an equal wedge, sounds like they need more stall. Not sure, what do ya think? I was using an old 8" ATi that was specified for an old 770 ish hp 528ci motor. The car ran great with the replacement 580ci wedge with 4:10 rear and we ran it for years. I recently changed from 4:10 to 3.73, stall speed increased from 5200 to 6100 and slip from 7% to 20% at the finish line. no changes to the engine, just blowing through the converter. I now have a 9.5" converter waiting to be fitted. Get a new one spec'd to your entire combo, a good converter company will usually ask for as much info available on the combo anyway. HTH's 
'74 Challenger..9.46 @ 145.9 1/4, 6.001 @ 118 1/8 so far. 4023lb !!! # N/A, Marsh performance 655ci, Indy Maxx, T/R, Indy 600-13 X's, Street legal, pump gas, full interior, Cal-Tracs, mufflers, 3:73's and real 10.5 radials.
9.51 @ 142.4 1/4, 6.003 @ 114 1/8 with our old mule KB, 572-13, 580 wedge.
RHD '68 Barracuda Fastback 323ci street/strip. Best ET 13.88 @ 99.03
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