Jammin'Trey

Ok, I bought a used Rochester Quadra jet today/ non CC from a 1972 nova. I rebuilt it and found the following,

G hanger for secondarys with DA rods.

71 Primary jets with 45B rods

It doesnt have an electric choke but it doesnt seem to be a manual choke either. I am not sure how I am going to run the coke with this on my camaro or how it works at all. Rebuild was easy except when I had to fish thatt darn tab downt the passengers side with the choke rod attached to it. But its done, I also re-epoxied the castings at the bottom. Is this a good setup? I noticed on the back it has a Holly Remanufactured sticker on it.

I also picked up the stock cast intake with it from the nova. It seems nice, freshly painted and all cleaned up. Will do for now until I can afford a performer RPM spreadbore. Paid 60$ for both and 14$ for rebuild kit so Im doing pretty good.

five7kid

iTrader: (14)

That was what was known as a "divorced choke". The thermostat was on the intake manifold on top of the exhaust cross-over passage. Between the heat riser valve, which forced exhaust through the intake manifold passage, and the thermostat sitting right on top of it, the choke opened as the engine warmed up.

It's a decent set-up, one advantage being it doesn't use vacuum to operate like the hot air choke did (but the hot air choke worked very well, in my experience).

I prefer the CC q-jet to the older ones, but it should work fine. I never got into the minutia of primary tuning with non-CC q-jets, so perhaps someone else can provide details there.

327_TPI_77_Maro

iTrader: (8)

You can just salvage an electric choke off a later carb and bolt it up. At least you can do that on the later year carbs, they have the same mounting provisions. A divorced choke on a manifold not set up for it is useless

Jammin'Trey

Cool, the guy called me today and said he had the little bi-metallic spring and also the linkage rod. I am using the stock intake for now, Plan on getting a performer rpm and a elec choke for it later. Maybe even go to a 650 dp....

But looks like my setup is almost correct for my motor. I am going to put in 75 main jets and a 43 rod and see what I get. I think it will work very well. I am using the factory Nova 350 intake with this carb. I think it will outperform my edelbrock setup anyday.

Jammin'Trey

Ok, got it on the car and running, base timing is set to 12 degrees.

I have a relativly lumpy cam for the stock powervalve IMO. Ill run by the symptoms with you guys to confirm it really could be the spring.

-Idle mixture screws dont do much of anything...
-Motor doesnt load up for a long time but it never has died, just cler it out and its good for a while...
-No black smoke when I blip the throttle from idle
-When I unhooked the pump shot it didnt bog at all when I took the carb and floored it.
-There is a distinct smell of gas from the exhaust like it is ritch

again on the primarys I have 71 jets and 45B rods. I am not sure of the power valve spring but my best guess is it isnt seating fully at idle ( not eneough vacuum). Any other tests I should run to confirm this? Where can I get diffrent springs?

Jammin'Trey

.030 over
Crank turned down .010
Zero decket
Hyperuretic flat top pisons with valve reliefs
882 heads, freshly punched out to 2.02 and 1.60, mildly ported.
Crane thumper cam...
Adv/Dur: 287/305
Intake/Exhaust Lift: .489/.476

This is my setup right now, I am running th estock cast iron intake for a 72 Nova.