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Valve Adjustment

by Phil Singher
editor@vclassics.com

Once the valve adjustment is correct -- and only then -- you're ready to set ignition timing and tune carburetors.

To determine Carter AFB carb flow, measure the butterfly bores and use the table below:

CFM

Venturi Diameter           

Bore Diameter
 

primary   

secondary

primary   

secondary

400

1 1/8

1 1/4

1 7/16

1 7/16

500

1 3/16

1 1/4

1 7/16

1 11/16

575

1 1/4

1 9/16

1 9/16

1 11/16

625

1 3/16

1 9/16

1 7/16

1 11/16

750

1 7/16

1 9/16

1 11/16

1 11/16

                           

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