This carb is a spread bore with square flange bolt pattern. List #'s 6708 -1 only. This Kit Has Only One Power Valve. Holley Premium Carb Rebuild Kit For List 6708-1 Double Pumper - Spread Bore With One Power Valve & Primary Fuel Bowl Vent Valve.
Holley 4150 Premium Carb Kit For 390-450 CFM D/P With External N/S & 1 P/V.
Holley 4150 Premium Carb Kit For 650-750 CFM- Spread Bore With 2 P/V.
Holley 4150 Premium Carb Kit List 6708 & 6709 D/P- S/B With 2 P/V & Vent Valve.
Holley 4150 Premium Carb Kit For 390-450 CFM For V/S With External N/S One P/V.
Holley 4150 Premium Carb Kit For 390-450 CFM D/P With External N/S & 2P/V.
Holley 4150 Premium Carb Kit For 550-600 CFM For V/S & 1 P/V & 3/8 Internal N/S.
