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Home >> Chevrolet >> 1966 >> Suburban 5.3L Eng >> Repair and Diagnosis >> Engine Performance >> Fuel Delivery >> ROCHESTER Model 4G 4-Barrel >> Adjustment >> Choke Rod
July 1: So it begins. Don't worry, this is not in the correct legal jurisdiction!

Choke Rod

With choke valve in wide open position, bring idle screw forward until it just touches fast idle cam. Screw should contact cam at scribed mark. To adjust, bend choke rod.

CARBURETOR OR ADJUSTMENT SPECIFICATIONS

Rochester Carb. No. Idle Speed (Engine RPM) (1) Float Level Setting (2) Float Level Setting (3) Float Drop Setting Accelerator Pump Setting Idle Vent Setting
Man. Trans. Auto. Trans.
7025125 450-500 450-500 1 17/32" 1 19/32" 2 1/4" 1 1/16" 31/32"
7036125 450-500 450-500 1 17/32" 1 19/32" 2 1/4" 1 1/16" 31/32"
7027125 500 500 1 17/32" 1 19/32" 2 1/4" 1 1/16" 31/32"
7027125 700 600 1 17/32" 1 19/32" 2 1/4" 1 1/16" 31/32"
(1) Manual transmission in Neutral and automatic transmission in "D".
(2) Primary float.
(3) Secondary float.