Stumble diagnosed and fixed holley carb
With the help of duke Williams , and Lars I solved a stumble on my l76 327 with a Holley 2818. The simple problem was the casting was cracked around the ball bearing retainer metal strip. This introduced too much distance and the ball never sealed on acceleration pump. The pictures show the very small but hugely significant performance issue. Between 1800-2700 rpm the car always had a big stumble that required feathering the throttle. Thanks to Jerry Luck fir repairing the carb.