2003 Holley Parts and Accessories

Hardware Kits, Replacement, Black Finish, Bolt Set, Intake Manifold Installation, EFI 4500, Model 300-294, 295, Chevy, 4.8L, 5.3L, 5.7L, 6.0L, Kit

Part Number: HLY-508-42

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Estimated Ship Date: Mar 9, 2026 if ordered today

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Valve Covers, Track Series, Centerbolt, Chevrolet Logo, Cast Aluminum, Black Gloss, Baffled, Chevy, LS, 5.7L, 6.0L, 6.2L, 7.0L, Pair

Part Number: HLY-241-294

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Estimated Ship Date: Mar 9, 2026 if ordered today

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Intake Manifold Adapters, LS Modular, Mid-Rise Intake, Adapter Plate, Cathedral Port Head, Aluminum, Satin Finish, Fasteners, Chevy, LS, 4.8-7.0L, Kit

Part Number: HLY-300-267

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Air Conditioning Compressor Brackets, for R4 Compressor, Aluminum, Black, Chevy, Small Block LS, Each

Part Number: HLY-20-133BK

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Weatherproof Connectors, Holley EFI, Hemi, MAP Sensor Connector, Sealed, 3-pin, Female, Black Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-240

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Estimated Ship Date: Mar 5, 2026 if ordered today

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Weatherproof Connectors, Holley EFI, Hemi CTS Connector, Main Harness, 1.5mm YESC, 2-pin, Female, Black Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-233

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Estimated Ship Date: Mar 5, 2026 if ordered today

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Engine Accessory Bracket Components, Engine Accessory, R4 Tensioner, Spacer, Aluminum, Cast Finish, Chevy, 4.8-7.0L, LS Based, Kit

Part Number: HLY-21-7

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Estimated Ship Date: Mar 9, 2026 if ordered today

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Weatherproof Connectors, Holley EFI, Ford Modular, CTS Connector, Main Harness, SSC, 2-pin, Female, Black Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-236

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Weatherproof Connectors, Holley EFI, Ford Modular/Coyote, Manifold Air Temp Connector, SSC, 2-pin, Female, Gray Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-237

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Estimated Ship Date: Mar 9, 2026 if ordered today

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Weatherproof Connectors, Holley EFI, Ford Modular/Coyote, Idle Air Control Connector, SSC, 2-pin, Female, Black Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-238

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Estimated Ship Date: Mar 9, 2026 if ordered today

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Weatherproof Connectors, Holley EFI, Modular/Coyote, Knock Sensor Connector, Main Harness, MX 150, 6-pin Male, Black Plastic, Pins, Seals, TPA, Each

Part Number: HLY-570-225

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Estimated Ship Date: Mar 4, 2026 if ordered today

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Weatherproof Connectors, Holley EFI, Hemi, Air Temperature Sensor Connector, Main Harness, Molex 2-pin, Female, Black Plastic, Pins, Seals, TPA, Each

Part Number: HLY-570-227

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Estimated Ship Date: Today

Weatherproof Connectors, Holley EFI, Hemi, CTS Connector, Main Harness, Molex 2-pin, Female, Black Plastic, includes Pins, Seals, TPA, Each

Part Number: HLY-570-228

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Estimated Ship Date: Mar 6, 2026 if ordered today

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Engine Management Systems, Terminator X MAX, 8-EV1 Injectors, 8-Coils, Drive-by-Wire, 3.5 in. Controller, Chrysler, Dodge, 5.7L, 6.1L, Non-VVT, Kit

Part Number: HLY-550-1420

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Engine Management Systems, Terminator X MAX, 8-EV1 Injectors, 8-Coils, Sensors, USB Tune Cable, Chevy, LS, 5.7L, 1x Cam, 24x Crank, Kit

Part Number: HLY-550-929T

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Fuel Injection Systems, Terminator X Max, Stealth 4150, 58X LS EFI, Four Injector, Throttle Body, Aluminum, Shiny, Trans Control, Chevy, 4.8-7.0L, Kit

Part Number: HLY-550-1063

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Engine Management Systems, Terminator X, Up to 8-EV1 Injectors, 8-Coils, Analog, O2 Sensor, Plug-and-Play, USB Tuning Cable, Ford, 4.6L, 5.4L, Kit

Part Number: HLY-550-1220

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Engine Management Systems, Terminator X, Up to 8-EV6 Injectors, 8-Coils, Analog, O2 Sensor, Plug-and-Play, USB Tuning Cable, Ford, 4.6L, 5.4L, Kit

Part Number: HLY-550-1221

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Fuel Injection Systems, Terminator X, Stealth 4150, 24X LS EFI, Four Injector, Throttle Body, Speed Density, Aluminum, Gold Chevy, 4.8-7.0L, Kit

Part Number: HLY-550-1022

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Weatherproof Connectors, Holley EFI, Hemi Cam Sensor Connector, Main Harness, Single-Pack, 3-pin, Female, Gray Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-232

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Estimated Ship Date: Mar 5, 2026 if ordered today

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Intake Manifolds, Sniper EFI, Dual Plenum, Cathedral Port, 102mm Throttle Body, 1,600-6,800 RPM, Aluminum, Black, Chevy, LS, 4.8-6.0L, Each

Part Number: SNE-820241

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Estimated Ship Date: Mar 11, 2026 if ordered today

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Crank Trigger Wheels, Holley EFI, Replacement, 12-1X LS, Hall Effect, 7.5 in. Diameter, Aluminum, Silver, Universal, Each

Part Number: HLY-556-181

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Estimated Ship Date: Mar 6, 2026 if ordered today

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Pulley Kits, LS Swap, Serpentine, Alternator, Power Steering, A/C, GM Type 2, 130 Amp Alternator, Black, Kit

Part Number: HLY-20-136BK

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Estimated Ship Date: Mar 6, 2026 if ordered today

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Weatherproof Connectors, Holley EFI, Hemi CTS Connector, Main Harness, APEX 2.8, 3-pin, Female, Black Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-235

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Estimated Ship Date: Mar 6, 2026 if ordered today

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Intake Manifold Bolt Set, Replacement Hardware Kit, Hemi Hi-Ram, Chrysler, Dodge, Ram, Kit

Part Number: HLY-300-655

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Estimated Ship Date: Mar 6, 2026 if ordered today

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