87fox72mach
Well-known member
- Joined
- Apr 22, 2011
- Messages
- 927
- Reaction score
- 21
- Location
- pa
- My Car
- 1995 firebird rebuilt motor 5 spd dail driver
1987 grand wagoneer plow truck
1987 mustang lx 5.0 work custom engine bay and paint
1972 mach 1 project
I finally have my car on the road and need some help tuning. here is my setup all parts new/ rebuilt
71 351c 4v heads
comp cams flat tappet cam duration 270/270 lift 519 519
rebult stock distrubtor with single vacuum advance and pertronix ignitor 3 and matching coil
autolite 25
edelbrock intake
holley 3310-c
4 speed trans
3:50 gears
vaccum about 15 at idle
Issues:
1.) bog with giving it slight gas while driving stutters, shutters, wants to die out, occasionally gives a small pop out of carb, I'm guessing this has to do with size of accelerator pump nozzle? right now has .31 in it not sure if I need to go smaller or bigger
2.) spark knock at higher rpm maybe 2800-3500 while under load acceleration, my timing is as follows without vac advance its at 12 btdc. with vacuum hooked up 26 @ 2000rpm. ive tried multiple combos with not much improvement
Me and my neighbor have been trying our best to get it right but he is an amc guy so he is not familiar with Cleveland. driving it after pulling out and rpms get a bit higher it goes better but to much acceleration it pings/ rattles
plugs have a slight carbon build up. a little rich? witish electrode tips, idle mixture screws have been adjusted
appreciate any leads hoping someone has used this carb and can get me close thanks!
71 351c 4v heads
comp cams flat tappet cam duration 270/270 lift 519 519
rebult stock distrubtor with single vacuum advance and pertronix ignitor 3 and matching coil
autolite 25
edelbrock intake
holley 3310-c
4 speed trans
3:50 gears
vaccum about 15 at idle
Issues:
1.) bog with giving it slight gas while driving stutters, shutters, wants to die out, occasionally gives a small pop out of carb, I'm guessing this has to do with size of accelerator pump nozzle? right now has .31 in it not sure if I need to go smaller or bigger
2.) spark knock at higher rpm maybe 2800-3500 while under load acceleration, my timing is as follows without vac advance its at 12 btdc. with vacuum hooked up 26 @ 2000rpm. ive tried multiple combos with not much improvement
Me and my neighbor have been trying our best to get it right but he is an amc guy so he is not familiar with Cleveland. driving it after pulling out and rpms get a bit higher it goes better but to much acceleration it pings/ rattles
plugs have a slight carbon build up. a little rich? witish electrode tips, idle mixture screws have been adjusted
appreciate any leads hoping someone has used this carb and can get me close thanks!