Chevy trucks in the 80' had the 800. My 85 c20 is 17080213, i have 6 or 7 of them for spares and parts, same with my 72 c20 chevy 7042208. I have many dealer manuals, tune up books and 1985 gm rochester new product book that lists all the numbers. I have been told, by someone that wrote a book that my gm dealer books are wrong, and that was only made in 78-79. Lol, holy cow. 800 cfm carbs are all over the place on gm trucks still driving around.

Pontiac had 800 on RA4 and SD 455 for sure

I picked up a 800cfm model for my mild 350sb. A bit of tuning and modification, and its a perfect carb. No bog or flat spots, great economy, and 400hp on the dyno with perfect AF across the range. I'll never use a Holley again.

I have a milk crate filled with quadrajet carbs. I also have a milk crate full of holleys.

I really like both the quadrajet and the thermoquad.

(I have a 7043250 ra 1223) qjet every place I look at all these videos and see they are all 750cfm or 800cfm. But called holley today for a replacement holley double pumper and they said a 600cfm is recommended for my olds 455 engine. Don't want to rob my car of hp if it needs. Let me know your thoughts thanks

Thanks for the video. Can the throttle plate bushings be replaced? (If they have them?) My idle is erratic, and I had to install a stronger return spring.

I have a Qjet 750 just like the one you showed. When I increase the throttle gently the engine tries to shut down but if I close the choke plate with my hand the engine stays on. its acceleration. If I accelerate quickly to full throttle it does so but then it tries to shut down, as if it won't suck gasoline.