I will be purchasing a 750cfm Q-Jet from a member (thanks Steve!) and I want to get a head start on any possible parts I might need to tune it for my setup. The carb is off a '73 Electra w/ a 350. I dont have the stamping yet, but Steve is positive it was original and is a 750cfm. He rebuilt it, so thats all good...he's just not sure what rods/jets are in it. My setup is a '72 350, TA310 Cam: 232 @ .050 int & exh, '70 high compression pistons, head work. Poston headers. Stock intake. So, what will i need to tune this baby up? any suggestions is appreciated. i've heard these carb/intake combo's like spacers...is this true? open spacer the best? TIA
All 73 Electras came with 455's if I am not mistaken and all 455 carbs 1n 73 were 800 cfm! Is the 4th digit in the part # a 3? Which would mean it came from a 73. Should start with #7043...
these are the 73 carb #s (Q-jets) 7043243 350 manual 7043244 350 auto 7043243 455 auto 7043240 455 auto 7043242 455 Stage-1
i've requested the stamping number from the seller, he'll get it to me soon. it's not a problem if it's a 455 or 350 800cfm, is it? the way i see it, if it's an 800cfm, even better, right?
You've got a pretty healthy cam there, so it should do fine with a 455 carb. The issue with 455 carbs on 350s isn't the cfm, but the differences in internal idle passages.
he got back to me and said it was a carb of a '73 LeSabre and it IS a 350 carb, 750cfm. still havent gotten the stamping numbers. still would like to know what rods/jets you guys would suggest. Much appreciated.
Keep the stock primary rods and try one or two jets richer. Experiment with secondary rods as they are easy to change.
