finished experimenting with exhaust cans. settled on 17" x 1.750" ID Thrush perf core glasspacks, which sound good and perform great on custom 2 into 2 1.500" headers. fresh top end rebuild '73 motor with porting.
using VM34's and have a rather vexing hesitation at approx 1/8 to 1/4 throttle under load (not when just blipping throttle). kick starts great, idles great, pulls very hard after 1/4 all the way to WOT. bog is also noticeable in 4th and 5th gear when soft pedaling it at low throttle opening.
25 pilots, air screws out 1 1/4 turns, P-6 NJ, 6F9 needles at 2nd from top, 190 mains, velocity stack screen temporarily over carbs, 2.0 slide cutaway.
thought i'd consult those who've tuned a few of these motors. don't know if that narrow dead spot is too rich or too lean.
my guess is go to 2.5 slides and/or 22.5 pilots with further air screw adjustment...
using VM34's and have a rather vexing hesitation at approx 1/8 to 1/4 throttle under load (not when just blipping throttle). kick starts great, idles great, pulls very hard after 1/4 all the way to WOT. bog is also noticeable in 4th and 5th gear when soft pedaling it at low throttle opening.
25 pilots, air screws out 1 1/4 turns, P-6 NJ, 6F9 needles at 2nd from top, 190 mains, velocity stack screen temporarily over carbs, 2.0 slide cutaway.
thought i'd consult those who've tuned a few of these motors. don't know if that narrow dead spot is too rich or too lean.
my guess is go to 2.5 slides and/or 22.5 pilots with further air screw adjustment...