Ya know I might be getting the choices confused. I just sold one not long ago to a buddy in Canada and seem to recall it being open, but maybe that was the Predator version?!? I cant seem to find the pictures but for some reason I thought they had both depending on how old they were...I cant see the "tent" being any help, I suppose the thinking behind it was to help direct flow to the 4 cylinders on each end?!? Seems like a bad way in my mind to build a tunnel ram but maybe I'm wrong. There is definitely a more "open" version, pretty sure it's the earlier one. It has about double the amount of bolts fastening the top plate. I don't know why Indy redesigned it ? Indy had a picture of a 572 (or a 588) going out to a customer, I noticed the T/R it had was fitted with a 1" spacer and asked if it was worth anything. The reply was "yes, a small gain between 7200 and 7500 rpm"
'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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