PEM Differential Case - 6.83 Ratio - 31 Spline - Steel Spool - Ford 9 in 91907 these regulators allow you to

these regulators allow you to stack them together to control multiple pressures with a single fuel pump

Reversible design for installation flexibility

secondary float with notches for jet extensions and a secondary float with notches that includes the jet extensions

Fits Holley 4150 Ultra HP carburetorsHolley has been the undisputed leader in fuel systems for over 100 years

PEM Differential Case - 6.83 Ratio - 31 Spline - Steel Spool - Ford 9 in 91907 these regulators allow you toProduct Description: Differential Case Assembled 6. 83 Ratio 31 Spline Steel Spool Natural Ford 9 in Sold Individually PEM Racing (Performance Engineering and Manufacturing) offers a wide selection of quick change gear sets, ring and pinion gears, differential cases, and other rear end components.