2003 Workhorse P-Series Engine
Select Your Submodel
- Engine Assemblies
- Engine Blocks
- Valves & Valvetrain Parts
- Pistons, Rings & Connecting Rods
- Oil Filters
- Serpentine Belts & Auxiliary Drive Belts
- Valve Covers
- Timing Gears, Chains & Covers
- Oil Pans, Drain Plugs & Dipsticks
- Cylinder Heads
- Engine Pulleys
- Engine Sensors, Relays, Switches
- Oil Pumps
- Oil Coolers
- Camshafts
- Crankshafts
- Engine Management Systems
- Engine Bearings
- Harmonic Balancers
- Engine Rebuild Kits
- Balance Shafts
- Throttle Bodies
- Carburetors
- Motor Oils
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Baldwin Filters®Spin-On Engine Oil FilterWorkhorse P-Series 8.1L 2003, Spin-On Engine Oil Filter by Baldwin Filters®. Dirty oil can cause catastrophic damage to your engine. By using the proper lube filter for your engine, you can minimize the possibility of costly downtime...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$9.67 - WIX®Engine Oil FilterWorkhorse P-Series 2003, Engine Oil Filter by WIX®. Designed utilizing the latest technology, this product by Wix features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...You use conventional, synthetic or synthetic-blended motor oilsYour drives are stop-and-go, either in the city or in heavy traffic$7.31 - $9.72
- WIX®Engine Oil FilterWorkhorse P-Series 2003, Engine Oil Filter by WIX®. Designed utilizing the latest technology, this product by Wix features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it is...You use conventional, synthetic or synthetic-blended motor oilsYour drives are stop-and-go, either in the city or in heavy traffic$7.31 - $9.72
- COMP Cams®High Energy™ Valve LifterWorkhorse P32 8.1L 2003, High Energy™ Valve Lifter by COMP Cams®. This high-grade product was designed with craftsmanship and key attention to detail and manufactured using leading-edge innovations by experienced and knowledgeable...Developed to provide steady performance and reliabilityMade using up-to-date equipment and new technologies$36.95 - $285.95
- Barnes®Oil Filter AdapterWorkhorse P-Series 5.7L 2003, Oil Filter Adapter by Barnes®. Designed utilizing the latest technology, this product by Barnes features premium quality and will perform better than advertised. Perfect for your vehicle and lifestyle, it...$201.27
- Premium Guard®Engine Oil FilterWorkhorse P-Series 5.7L 2003, Engine Oil Filter by Premium Guard®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$2.25
- Premium Guard®Engine Oil FilterWorkhorse P-Series 5.7L 2003, Engine Oil Filter by Premium Guard®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$2.25
- ARP®Rocker Arm Stud KitWorkhorse P-Series 2003, Rocker Arm Stud Kit by ARP®. The engineers at ARP spent quite a bit of time developing these highly effective, unique oil pan studs. They’re designed to make it as easy as possible to install a pan and seal it...Designed to unlock more performance out of your vehicleDeliver a reasonable balance of strength and durability$103.59
- PAI®Piston RingWorkhorse P-Series 3.9L 2003, Piston Ring by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$7.35
- PPE®Main Stud KitWorkhorse P-Series 5.7L / 6.0L / 6.5L / 8.1L 2003, Main Stud Kit by PPE®. Increasing the boost that is fed into your truck engine is great for horsepower, but it places additional stress on stock pieces that were not designed to take...Made from 8740 chromoly with black oxide finishThread-rolled to Mil-S-8879 specifications$229.49 - $292.64
- Moroso®Rear Main Seal AdapterWorkhorse P-Series 5.7L 2003, Rear Main Seal Adapter by Moroso®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$225.99 - $252.99
- Gates®Micro-V™ V-Ribbed BeltWorkhorse P-Series 2003, Micro-V™ V-Ribbed Belt by Gates®. Gates is the largest global manufacturer of OE timing belts. This means Gates is able to cover the Aftermarket with timing belts that are OE-equivalent, or better, in service...Special belt construction eliminates belt noise, reduces tension loss, and solves problem drive applicationsUtilizes advanced materials like Aramid Fiber found in bullet-proof vests and crack and heat-resistant EPDM materials$23.67 - $34.17
- ACDelco®Specialty™ Heavy Duty V-Ribbed Serpentine BeltWorkhorse P-Series 2003, Specialty™ Heavy Duty V-Ribbed Serpentine Belt by ACDelco®. Designed utilizing the latest technology, this product by ACDelco features premium quality and will perform better than advertised. Perfect for your...Made with precision and quality in mindDesigned to meet your specific needs$30.83 - $46.16
- Dorman®Autograde™ Engine Oil Drain PlugWorkhorse P-Series 2003, Autograde™ Engine Oil Drain Plug by Dorman®. Dorman's Oil Drain Plugs are coated for high corrosion resistance and a long service life. Designed to provide a perfect fit for a hassle free installation, this...Oil Drain Plugs are designed and constructed to strict engineering quality standardsThe finest quality at a great price$3.43 - $30.26
- Gates®DriveAlign™ Drive Belt Idler PulleyWorkhorse P-Series 2003, DriveAlign™ Drive Belt Idler Pulley by Gates®. Built to last by resisting dirt, salt, and other under-hood contaminants and are designed for use on passenger cars and light trucks as a locked center tensioning...High quality construction provides high durability for long lifeBearing meets or exceeds OE and is designed for application specific speed and load requirements$18.38 - $37.96
- Continental® ContiTech™Elite™ Drive Belt Idler AssemblyWorkhorse P-Series 8.1L 2003, Elite™ Drive Belt Idler Assembly by Continental® ContiTech™. Every part in this assembly is engineered to look, install, and operate the same way or better than the factory parts. Every component meets...Original equipment equivalentFactory-like fit and dependability$13.74 - $27.97
- Dayco®No Slack™ Automatic Belt Tensioner AssemblyWorkhorse P-Series 2003, No Slack™ Automatic Belt Tensioner Assembly by Dayco®. Serpentine belt drives consist of a single belt that powers most, if not all, of the engine’s accessories. Designed to maintain constant tension on...Heavy duty cast aluminum spring case that resists cracking and fatigueSteel pivot tube which provides additional strength for critical torque requirements$41.43 - $63.01
- PAI®Rear Crankshaft SealWorkhorse P-Series 3.9L 2003, Rear Crankshaft Seal by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$25.40 - $54.02
- PAI®Rear Crankshaft SealWorkhorse P-Series 3.9L 2003, Rear Crankshaft Seal by PAI®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship....Perfect blend of leading innovations and superior workmanshipManufactured to offer high value and everlasting reliability$25.40 - $54.02
- ACDelco®Professional™ Standard V-Ribbed Serpentine BeltWorkhorse P-Series 2003, Professional™ Standard V-Ribbed Serpentine Belt by ACDelco®. Made of EPDM rubber for long life and quiet, dependable performance, ACDelco Professional Automotive Belts are designed to meet or exceed OEM...Made with precision and quality in mindDesigned to meet your specific needs$38.04 - $56.63
- Continental® ContiTech™Conti-V Multirib™ Serpentine BeltWorkhorse P-Series 8.1L 2003, Conti-V Multirib™ Serpentine Belt by Continental® ContiTech™. Designed to transmit torque and drive engine accessories, this serpentine belt provides quieter and cooler performance, greater durability,...OE quality product for safe, reliable, and efficient performanceProvides quiet performance, even in wet conditions$19.91 - $24.34
- Continental® ContiTech™Conti-V Multirib™ V-BeltWorkhorse P-Series 8.1L 2003, Conti-V Multirib™ V-Belt by Continental® ContiTech™. Designed to transmit torque and drive engine accessories, this serpentine belt provides quieter and cooler performance, greater durability, and...OE quality product for safe, reliable, and efficient performanceProvides quiet performance, even in wet conditions$31.07
- Dayco®Drive Rite™ V-Ribbed Serpentine BeltWorkhorse P32 6.5L 2003, Drive Rite™ V-Ribbed Serpentine Belt by Dayco®. Specially constructed for vehicles that utilize the multiple-belt system, this product features raw-edge construction along with a patented top cogged design,...More flexibility and increased airflow around the belt for prolonged service lifeRaw-edge sidewall construction along with a patented top cogged design for top performance$20.28 - $22.48
- Dayco®Poly Rib™ Serpentine BeltWorkhorse P32 6.5L 2003, Poly Rib™ Serpentine Belt by Dayco®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and reliability....Made with precision and quality in mindDesigned to meet your specific needs$33.15 - $36.58
- Goodyear Belts®Serpentine Multi V-BeltWorkhorse P-Series 2003, Serpentine Multi V-Belt by Goodyear Belts®. Goodyear Belts has developed multi V-belts that meet or exceed OE requirements, ensuring long belt life and quiet operation. Restore your belt drive system’s...Meets or Exceeds OEM SpecificationsLong-life EPDM Rubber Compound$26.57 - $33.95
- Dorman®HELP™ Engine Oil Dipstick without Bracket & TubeWorkhorse P-Series 5.7L 2003, HELP™ Engine Oil Dipstick without Bracket & Tube by Dorman®. This replacement engine oil dipstick is a direct replacement for a damaged or missing original equipment dipstick. Level marks are clearly...Ideal replacement - this engine oil dipstick matches the fit and function of the original equipment dipstick to ensure a dependable replacementQuality construction - this dipstick is made of the same materials as the original equipment dipstick for reliable service$14.44
- Dorman®OE Solutions™ Engine Oil PanWorkhorse P-Series 2003, OE Solutions™ Engine Oil Pan by Dorman®. Oil pan leaking? This engine oil pan is precision-engineered to match the original equipment pan on specific vehicle years, makes and models for a reliable replacement.Direct replacement - this engine oil pan is made to match the original pan on specific vehiclesComplete assembly - includes replacement pan and drain plugs to match original components$39.87 - $94.10
- SKP®Engine Oil PanWorkhorse P-Series 6.5L 2003, Engine Oil Pan by SKP®. This top-grade product is expertly made in compliance with stringent industry standards to offer a fusion of a well-balanced design and high level of craftsmanship. Manufactured from...Designed to deliver trouble-free, consistent performanceRight for your vehicle and lifestyle$79.38
- Gates®DriveAlign™ Automatic Belt TensionerWorkhorse P-Series 2003, DriveAlign™ Automatic Belt Tensioner by Gates®. This premium product is the best way to go for those looking for the highest quality replacement that offers supreme levels of quality, performance and...Comprehensive line includes parts to fit cars, vans, SUVs, and light trucksFull line coverage for import, domestic, and heavy-duty cars, trucks, and vehicle applications$36.53 - $71.69
- ACDelco®Professional™ Drive Belt Idler PulleyWorkhorse P-Series 2003, Professional™ Drive Belt Idler Pulley by ACDelco®. The ACDelco Professional, premium aftermarket Idler Pulley is designed for use on automobiles and light duty trucks as a locked center tensioning pulley, an...Bearing is designed for application specific speed and load requirementsProvides reliable operation under severe conditions for year round performance$19.61
