Holley Main Jets (2) - 77 Helmet Shield This Electric Pressure Control Valve

This Electric Pressure Control Valve Kit is for a discharge/refill of 35-40 PSI

2001-2004 GMC Sierra 2500 HD

Use Edelbrock Step Washer Kit #9693 on 1967-69 engines with 7/16" head bolts

1975-1979 Chevrolet K5 Blazer

Holley Main Jets (2) - 77 Helmet Shield This Electric Pressure Control ValveSet of two carburetor main jets. 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 scene as well. Holley's products also include performance fuel pumps, intake manifolds and