General Category > Quadrajet Carb Talk and Tips
1972 chevy c30
jbh7052:
Thanks 77cruiser!
jbh7052:
Got the Transmission done and back in the 72! Carb rebuilt with cliffs kit. Started and idled first thing! However I was unable to get the APT screw to break loose....maybe I am a little chicken to get mean with it. Anyway, after discovering the throttle cable was a 1 1/2 in short of full travel and got the tv cable adjusted for good line pressure to the fresh 700R4 I am on the road. Again this is a stock 350 in a 1972 C-30 with 4:10 gears so it aint no race car! truck weighs 5,500lbs so she is a little beefy! Seams to be a little sluggish for in town driving but it cruises at 70mph with minimal throttle! Timing is set to 8 deg before TDC with HEI dist and a vacuum advance attached to ported vacuum source front right of carb just above throttle plates. Do I understand Cliffs book correctly that the APT only helps with part throttle or cruise applications? The gas mileage in town is hideous which I believe the APT will help with correct or will it only help with the steady throttle position?
Cliff Ruggles:
With a C-30 truck and 4.10 gears I wouldn't expect great fuel economy in the city for stop and start driving. It still should be decent when everything is tuned correctly.
I owned a 1970 GMC 3/4 ton truck many years ago with a stock 350 and 4.10 gears. I ran 7.50-16" tires on it. The engine was rebuilt back to stock with a GM 350/300hp camshaft. It did pretty good for fuel economy for what it was. Averaged around 11-12mpg's and a little better at 14-15mpg's on the highway cruising around 65-70mph........Cliff
jbh7052:
Well sounds like I am not far off then! Thanks for the advice and another great rebuild! It has a little hot start issue. I am gonna bump the float down a little off the factory setting and see if it improves. Thanks again!
Cliff Ruggles:
I'd set the float at 1/4" and look elsewhere for the hot start issues......Cliff
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