Hi all,

I'm tuning my carb at the moment and got curious what others use successfully.

I'm interested in the jet and primary metering rod combination in your non-cc Q-jets.

Also, what mpg city and highway do you get with your setup. Do you have any 1/4 times for it too?

Thanks
Alex

I think I used 77 jets and 52 rods primary (stock 77 L82 vette jetting), with a CH or CK rear rod and a G hanger. 350 with mild cam and crappy stock heads. When I got better heads, primary stayed the same and I stepped up rear to a DA rod. Best way to tell is at the track, not seat of the pants.

Run a 70 primary jet, .050M primary rod, DR secondary rod, and F hanger in mine. It is on my 350 with a RV cam and 305 TPI heads. Ran great times-dyno # in my sig. Gets almost 20 MPG on the highway in a van at 75+ MPH.

For a typical mild performance street driven 350:

Primary jet: 74-76
Primary rod: 44-46 ("B" style rod if it's an old QJet with a divorced-style choke, "K" style rod if it's a later QJet with the round choke housing on the pass. side of the carb)
Power piston spring: 6" vacuum opening point
Secondary rod: DR
Secondary hanger: G

If the carb is assembled correctly and functioning properly this should get decent mileage and "hit" like it's fuel injected when you nail it. I've put MANY cars deep in the 13s/high 12s with this exact calibration.

I also do modifications to the idle circuits to fatten them up on many carbs. Stock QJets are ALL emissions carbs and the idle circuits are usually too lean to allow enough adjustment range to work well on a modified/larger displacement engine.

Honestly I dont know, Holley reman. I know it has DR rods and a G hanger but thats about it.