2003 Holley Parts and Accessories

Engine Management Systems, HP EFI, ECU and Harness, Up to 16-Injectors, 8-Coils, Bosch O2 Sensor, Wideband, CANBUS, Ford, 4-valve, 4.6L, 5.4L, Kit

Part Number: HLY-550-617

1.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 27, 2026 if ordered today

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Engine Management Systems, HP EFI, ECU and Harness, Connects 16-Injectors, 8-Coils, Bosch O2, Wideband, Ford, Lincoln, Mercury, 2V, 4.6L, 5.4L, Kit

Part Number: HLY-550-616

5.0 out of 5 stars ( 1 )

Estimated Ship Date: Apr 27, 2026 if ordered today

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Hardware Kits, Split Intake Manifold, O-rings, Cord, Hardware, Silver Finish, Intake 300-255, 300-256, 300-290, 300-291, Chevy, LS, 4.8-7.0L, Kit

Part Number: HLY-508-31

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Accessory Drive Systems, LS Mid-mount, Serpentine, Alternator, Water Pump, Clockwise, Tensioner, SFI Damper, Natrual Finish, Chevy, 4.8-7.0L, Kit

Part Number: HLY-20-182

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Estimated Ship Date: Apr 27, 2026 if ordered today

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Pulley Kits, LS Swap, Serpentine, Alternator, Power Steering, A/C, Kit

Part Number: HLY-20-162P

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Estimated Ship Date: Apr 27, 2026 if ordered today

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Valve Covers, Aluminum LS, Centerbolt, Plain Top, Cast Aluminum, Natural Finish, Baffled, Chevy, LS, 4.8L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L, Pair

Part Number: HLY-241-92

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Accessory Drive Systems, LS Mid-Mount, Serpentine, Alternator, Water Pump, Counterclockwise, Pulleys, 6-groove, Black Finish, Chevy, 4.8-7.0L, Kit

Part Number: HLY-20-187BK

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Intake Manifolds, EFI, Hi-Ram, Multi-port, Top Only, 95mm Bore, Cast Aluminum, Black Finish, Chevy, LS, 4.8L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L,Each

Part Number: HLY-300-245BK

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Pulley Sets, Serpentine, LS Engine Swap Accessory Drive System, Without A/C, Black Powdercoated, Chevy, V8, Kit

Part Number: HLY-20-143BK

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Estimated Ship Date: Apr 27, 2026 if ordered today

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Hoses and Lines, Power Steering, 6 AN Hardline, Steel, Chrome, Fittings, Crush Washers, Chrysler, Dodge, Jeep, 5.7-6.4L, Gen III, Hemi, Each

Part Number: HLY-198-205

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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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Weatherproof Connectors, Holley EFI, Ford Coyote/Modular, TPS Connector, Main Harness, DMS 3-pin, Female, Black Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-231

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Ignition Coil Wiring Harnesses, Holley EFI, Coil Harness, Ford 4V Modular, Plug-and-Play, for HP, Dominator EFI Systems, Ford, Mustang, 4.6L, Each

Part Number: HLY-558-315

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Estimated Ship Date: Apr 27, 2026 if ordered today

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Intake Manifolds, Sniper EFI, Hi-Ram, Cathedral Port, 90mm Throttle Body, 2,100-8,200 RPM, Welded Aluminum, Silver, Chevy, LS, 4.8-6.0L, Each

Part Number: SNE-832141

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Estimated Ship Date: May 4, 2026 if ordered today

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Pulley Sets, Serpentine, LS Engine Swap Accessory Drive System, Without A/C, Chevy, V8, Kit

Part Number: HLY-20-143

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Estimated Ship Date: Apr 27, 2026 if ordered today

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

Part Number: HLY-570-230

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Pulley Sets, Serpentine, LS Engine Swap Accessory Drive System, Sanden 508 A/C Only, Black Powdercoated, Chevy, V8, Kit

Part Number: HLY-20-141BK

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Dash Panels, Holley EFI, 7 in. Dash Bezel, 5/32 in. Thick, ABS Material, Black Matte Finish, Chevy, S10, GMC, Sonoma, Trucks, Each

Part Number: HLY-553-315

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Wiring Harnesses, Holley EFI, Gen III Hemi, Throttle Position, Idle Air Controls, Factory Connectors, Chrysler, Dodge, Jeep, Hemi, Early Model, Each

Part Number: HLY-558-115

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Estimated Ship Date: Apr 27, 2026 if ordered today

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Timing Covers, Replacement, Cast Aluminum, Black Finish, for Mid-Mount Accessory Drive 20-291BK, 20-293BK, Gen III, Hemi, VVT, 5.7L, 6.4L, Each

Part Number: HLY-97-375

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Valve Covers, Aluminum LS, Centerbolt, Plain Top, Cast Aluminum, Polished, Baffled, Chevy, LS, 4.8L, 5.3L, 5.7L, 6.0L, 6.2L, 7.0L, Pair

Part Number: HLY-241-90

4.75 out of 5 stars ( 4 )

Estimated Ship Date: Apr 27, 2026 if ordered today

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Intake Manifolds, Sniper EFI, Fabricated, Cathedral Port, 4150 Style Flange, 2,200-6,800 RPM, Aluminum, Black, Chevy, LS Base, 4.8-6.0L, Each

Part Number: SNE-820051

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Estimated Ship Date: May 1, 2026 if ordered today

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Weatherproof Connectors, Holley EFI, Hemi Cam/Crank Connector, Main Harness, APEX 1.2, 3-pin, Female, Black Plastic, with Pins, Seals, TPA, Each

Part Number: HLY-570-234

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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: Apr 28, 2026 if ordered today

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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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Estimated Ship Date: Apr 27, 2026 if ordered today

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