Flange Size: 1 1/8",
Upper Well: Depth from stand pipe seat, 1/4"
Lower Well: 11/32" ID
Float Level: Top of float to be 11/16" from machined surface of casting at point opposite needle, with needle seated.
Inside Vent: No. 50 drill.
Gasoline Intake: Square vertical needle. No. 38 hole in needle seat.
Gas Line Connection: 5/16"
Low Speed Jet Tube: Jet, No. 70 drill.
Idle Port: Length .176", Width: .030". Opening above valve with valve closed tight: .032" to .036"
By Pass: under idle port No. 53 drill.
Set Idle Adjustment Screw: 3/4 to 1 1/4 turn open. For richer mixture, turn screw in. Do not idle engine below 300 RPM with spark retarded.
Main Sell Jet No. 55 drill.
Multiple Jet Nozzle: Vertical jet, No. 48 drill. Top I.D. No. 26 drill size.
Accelerating Jets (Combination No. 70):
4 No. 60, 9/16" from top.
2 No. 55, 1 5/16" from top.
2 No. 55, 1 11/32" from top.