My 511 when it had 11.3-1 CR and a little smaller cam than the one in my 440 made 655 HP @ 5900 with a 1 7/8x3 header. The heads off that 511 are now on this 440. This engine will be Dyno'd on same dyno. I have my buddy's 950 QTP, so it could go 650 + with that 950 and a 1" spacer and a 2x3.5 header?

1971 Plum Crazy Super Bee. 572 World Aluminum block with a Cope 727 & Dana 4.10 out back. 9.88 @ 138 with a 1.35 60 NA. Dialed back to 10.0’s. 4000 lbs with me in it.