Holley Vacuum Secondary Diaphragm - Carburetor Model Numbers R1848-1/R3220/R6299-1/R8007 RG300033XL 3-1/2 x 3-5/8 in Round

3-1/2 x 3-5/8 in Round Body

Stackable carbureted regulator

Go EFI 4 Power Adder

Fuel Type: Diesel

2-speed and some 4-speed applications require optional accessories

Holley Vacuum Secondary Diaphragm - Carburetor Model Numbers R1848-1/R3220/R6299-1/R8007 RG300033XL 3-1/2 x 3-5/8 in RoundHolley Vacuum Secondary Diaphragm 135 2 Carburetor Model Numbers R1848 1 R3220 R6299 1 R8007 Vacuum Secondary Diaphragm Holley has been the undisputed leader in fuel systems for over 100 years. Holley carburetors powered every NASCAR Cup team and nearly every NHRA Pro Stock champion for four decades. Now, Holley EFI products power these cars and are dominating the performance world. Holley products for GM's popular LS engine are dominating the LS