[lovehamr]

AL, I don't see how you can get that number from that calculator without using a silly low VE. I plugged in 427ci, 6200rpm, .9 VE and a mod carb = 845cfm. If I use 1.0 VE then I get 939cfm. Granted your motor may never reach 100% VE but to short it that much right from the get-go IS going to cost you HP. I'd lay $$ on that. In fact, going back and looking at the graph, I was being generous when I said that I thought the engine would nose over at 5800. Using those same #s it looks like it'll run out of carb around 4250rpm. I say 4250 because the graph shows it using 606cfm @ 4000 and 681cfm @ 4500.