[bullseyeprec]

My car ran good with 72 and 80 jets but when the weather warmed up It didnt run quite as well...so I checked plugs...LEAN! everything was white!! I have a 567/576 lift roller 392, single plane, 4150 750 double pumper with orange cam and factory powervalve. I looked at ford motorsports and they said bigger jets at my elevation (almost sea level) so I went with 74/86 jets and plugs look good. In the meantime I developed a hesitation off idle...if accelerating slowly...so I swapped pump nozzles from 25, 28, 31 and I could adjust it to either off idle hesitation or good off idle but would stubble or have a dead spot at 2K at slow acceleration. It was sat night and speed shop was closed...my smallest bit was a .040 so I drilled it from a 31 to a 40 on the primary side.and all problems went away. I hope it runs good in 100 degree weather I am really tired of swapping out parts!!!!! I had a friend tell me that installing adj air bleeds (the screw in type) would help the engine rpm drop when you let of idle faster than it does now but I am afraid to do it since it runs so well now. I thought rpm drop was due mostly to flywheel weight but I may have been wrong. I have never had so much trouble tuning a carb! SO maybe jumping pump shooters a bunch would help..they are easy and cheap to swap. I adjusted the over travle screw so that it shoots fuel as soon as throttle is cracked and made sure I hade clearance at WOT by mashing pump with screw driver with throotle wide open. There ar so mnay variables that effect the carb my recipie mint not work for every car, it just worked well on mine. BTW I have a 30 cc pump. Good luck