i was just wonderind what size carb in cfm a 1981 gmc k1500 was stock if anyone knows i would like to know
thanks
The 305's came with an 850 CFM Quadrajet. The typical Quadrajet is 780CFM and they are excellent carbs when properly built and tuned. They are about the best "Dual" purpose carbs you can get.
If you still have the truck, keep the Quadrajet.
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If this was a V8, it most likely had a Quadrajet.
They are variable cfm, but when fully open can get 1200 cfm through them.
Many people have made them into highly competitive carberators with some fine tuning. These are very adjustable, and can really work well when set right.
The biggest performance limiter was the air cleaner.
Most people turned the lid over to get more air to the engine.
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Auto tech 25 yrs
Old GM mechanic
around 500 cfm no way is it 1200 no way in hell you cant even get 1200 out of a holley 850 and that is a way better carb
References :
The 305's came with an 850 CFM Quadrajet. The typical Quadrajet is 780CFM and they are excellent carbs when properly built and tuned. They are about the best "Dual" purpose carbs you can get.
If you still have the truck, keep the Quadrajet.
References :
Most Q-jets are 695 cfm and are excellent carbs.
I used a couple on sleepers that had 450 hp on tap.
References :
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