Thanks for the reply Pwmax, you explained it really well.
BTW, what head you would recommend for this:
-Drag only, bracket racing, race fuel
-12.5:1 comp (with 119cc chambers), 509cid (4.5x4.0) shortblock
-I want to keep this between below 7400rpm, stock 502cid 1053 crank
-8" converter, 5000+ stallspeed
-Cam that I have is 272/278 @ 0.050, .700lift,
-Big Dart single plane, 1050cfm Dominator
My car has now parts above, Merlin iron heads, 2.19 intake, 1.88 exhaust, ported. Runs 8.9x at 150+ in 2400lb tube chassis car with a Glide, 4.11 or 4.33 gear, 32x14x15 GY. So maybe 700hp at the crank?
I was thinking AFR 345 or Dart 345. Maybe something from Brodix? Any others? Or should I go with the Dart 355/AFR 357 CNC head, is the extra 1000$ worth it? It would be nice to run deeper in the eights (my car has the 8.5 chassis tag) or tame it down to Super Comp with a throttle stop.