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4L V8 1989 - 1991 Chevrolet R3500 454/7
Idle Mixture Screw Replacement Cork Gasket
BH2374 or BH2375 Headers Developed Specifically for this Vehicle
50-State Legal C
Brand Holley Color Black Emission Code 5 Fuel System EFI/Carb Fuel Type Gasoline Inlet Size 6 AN O-Ring Material Aluminum Outlet Size 6 AN O-Ring Product Type Fuel Pressure Regulator Return Size 6 AN O-Ring Style Bypass Warranty Limited 90 Day
LS Valve Covers - Polished - 241-90 flowmonster 4L V8 1989 - 1991Overview: Holley's cast aluminum valve covers for GM LS engines provide a fresh, refined look without the need to relocate the coils. There's no question the factory "coil on cover" design gives the LS that signature high tech look, but the factory brackets and coil location leave room for improvement. Clean up that signature look with Holley's LS Valve Covers! They incorporate a radiused shape, angled coil mounting, and a billet fill cap. Plus, the
