Carburetor, JET, Rochester Quadrajet, 1974-78, SB Chevy, 750 CFM

1974-78 Chevrolet Small Block 750 CFM Rochester Quadrajet Carburetor by JET Performance®

Recalibrated cores include sealed casting plugs, a new float and bronze-bushed throttle shafts.

This JET Performance® 750 CFM Rochester Quadrajet starts with a selected core that is completely disassembled, cleaned and inspected. Casting plugs are epoxy-sealed to prevent fuel leak-down into the intake. Circuits are checked for sizing, with jets and primary/secondary metering rods matched to the calibration. Idle, off-idle, main, accelerator-pump and high-speed circuits are recalibrated for the intended engine combination. Reassembly includes a new float, choke pull-off and bronze-bushed throttle shafts. Choose Stage 1 for a stock engine or Stage 2 for a compatible mildly modified street/strip combination. Match the carburetor stage to the intake, headers, cylinder heads and camshaft rather than expecting one calibration to suit every build.

• 1974-78 Chevrolet Small Block engine coverage • 750 CFM Rochester Quadrajet layout • Stage 1 or Stage 2 calibration • Fully cleaned and inspected original core • Epoxy-sealed casting plugs resist leak-down • Recalibrated fuel and transition circuits • New float and choke pull-off installed • Bronze-bushed throttle shafts • Stage 2: dual-plane intake, headers and mildly modified heads • Stage 2: 8.5-9.5:1 compression; 210-220 degrees at .050 lift • Stage 2: 110-112-degree camshaft lobe separation