Qjet to 2bbl swap?

[Scruffy49]

The factory installed Qjet on my truck is at paperweight status. It basically sweats gas.

Ordered the adapter to run a 2bbl on the stock high rise iron intake.

Pulled the original issue 40 years old distributor yesterday. New distributor, plugs and wires going in today.

Truck has a Th400 and 2.73 gears. Dual pcv valves, breather type oil filler cap, and still has the evap system. So will have to run a Ford style pcv compatible base gasket. 500cfm capable Holley.

Curious as to what drivabilty issues I should expect. Truck is an 85 C10 swb, with a 4.3L V6…

 

[Tank6x2]

Slow off the line but great legs once your up and going with good fuel mileage

 

[fast 99]

A Q-jet has smaller primaries than a 2 V Holley 500. Provided your foot doesn't open the secondaries Q-jets are an economical design.

 

[82sbshortbed]

Yup just keep your foot out of it and it will be a 2 barrel. You can here the back barrels open if you mash to hard.

 

[Scruffy49]

Just put a Qjet back on, throttle everything is incompatible. Holley is going on the 318/727 combo it was initially purchased for. I do have a GM 2bbl I could try, but it is governed.

 

[GTX63]

Speaking from experience and as someone who drove them back in the day like granny with a short leg, I never, ever experienced better gas mileage with a Rochester 2bbl over a Qjet. All things equal, there may be a 20% difference, or less, in mpg between it and a V8.

 

[PrairieDrifter]

I had a secondary problem, tried staying out of the secondaries. Realized how LITTLE I use the secondaries, I'm lifted on 35's too. Hardly ever got into the secondaries with normal driving. I was pretty shocked.