Just been doing some experimenting with the 750 HP Holley double on my 408 small block 69 Barracuda after reading the power valve thread. Fitted an afr gauge to check the cruise afr's.
Original setup after dyno was 74/82 jets, 6.5 power valve. Seemed to cruise rich and had a hole in the middle under acceleration but full throttle was fine.
Fitted 72 primary jets and a 10.5 inch power valve. Idle was 13.5:1, light throttle cruise was around 11.8:1, 3000 to 3500 at 60 to 70 mph was 12.4:1....
Holley running rich at part throttle cruise
