For a 5.7L Vortec L31 that still has its original CSFI/SCPI injector spider, the replacement to investigate is an MFI/MPFI spider injector assembly—not a universal “performance upgrade.” GM service material describes replacing the SCPI assembly with an MFI assembly in specific circumstances, but fitment depends on the vehicle’s year, engine, emissions configuration, and VIN. Diagnose symptoms before buying parts, then confirm the exact application in a current catalog.
What is the 5.7 Vortec spider injector upgrade?
The original central fuel-injection system is commonly described as CSFI or SCPI: a central assembly feeds fuel through poppet valves to the cylinders. MFI, also called MPFI in parts listings, is the replacement architecture identified in GM service material and parts-industry descriptions. NAPA Echlin describes the CPI-to-MFI conversion as using updated flexible injector assemblies. The terminology can vary by source, so compare the actual assembly and application rather than relying on a listing title alone.
GM’s service bulletin 99066G describes replacing the SCPI assembly with a new MFI assembly under its stated conditions. That supports the MFI assembly as the relevant service-replacement path for covered vehicles; it does not establish that every 5.7L Vortec should be converted or that the change increases horsepower or guarantees improved reliability. Read GM Service Operations bulletin 99066G. NAPA Echlin’s Vortec fuel-injection overview explains the system-level conversion.
Which injector assembly should you look for?
Use “5.7L Vortec MPFI spider injector assembly” as a starting shopping phrase, not as proof of compatibility. A Go-Parts guide identifies ACDelco 217-3029 as an MFI conversion kit for 5.0L and 5.7L V8 applications and advises checking the specific vehicle and VIN. Treat that number as a lead: the available material does not establish current OEM catalog status, supersessions, or universal fitment. See the Go-Parts application guide.
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- 【Reference Part Numbers】89060440, 25340347, 17114163, 17115381, 2173029, 93441235, FJ10566, 4G1888, 63886, FJ105, FJ504, 16970, 238887, 833-22105-8, 833221058, 833-22102-8, 833221028, 800-1513N, 8001513N, M1046, 217-3029, 2173029, 10725, 19210687
- 【Fitment】1996-2000 C1500 C2500; 1996-2002 Express 1500 2500 3500; 1996-1999 K1500 K2500 K3500; 1996-1999 P30; 1996-1999 Suburban C/K 1500 2500; 1996-2000 Tahoe; 1996-1999 G-M-C C/K 1500 2500 3500; 1996-2002 Savana 1500 2500 3500; 1996-2002 Suburban 1500 2500 3500; 1996-2000 Yukon
- 【Feature】This Fuel Injector Kits contain the necessary parts to service a fuel injector, and are direct replacement for your vehicle's original components. The fuel injector atomizes the fuel with the air entering the engine cylinder to form a combustible mixture. This replacement fuel injector kits have been manufactured to fit your vehicles, providing the same performance, durability, and service life you expect from the original manufacturer.
- 【Note】This Fuel Injector is DIFFERENT from the injector on Vortec 4.3L V6 engines and those 2 can NOT replace each other. Please do confirm first before ordering. Or just send us your VIN number and we'll do the check for you directly.
- 【Choose Our Product】We offer 1 year product quality support to our customers. Each item undergoes rigorous quality control to ensure you can drive with peace of mind
A separate AutoNation Parts listing describes a remanufactured MFI/MPFI service assembly and gives example truck, SUV, and van applications within its own year limits. Its listed examples do not confirm compatibility with other years or configurations. Review the AutoNation listing and its application details.
Compare the actual service-part options
| Check | Original-style CSFI/SCPI replacement | MFI/MPFI replacement assembly |
|---|---|---|
| Architecture | Retains the central poppet-valve arrangement. | Uses the MFI replacement architecture named in GM service material. |
| Application evidence | Confirm the exact vehicle and VIN in a current catalog; the available sources do not establish universal fitment. | GM describes this as the replacement in specified service circumstances; confirm exact year, engine, emissions configuration, and VIN. |
| New or remanufactured | Depends on the specific listing; verify before purchase. | Depends on the specific listing; the AutoNation example is described as remanufactured. |
| Kit contents, seals, and gaskets | Not established for all listings; inspect the product contents. | Not established for all listings; inspect the product contents and avoid buying duplicate or incompatible seals. |
| Warranty and seller support | Not stated in the cited material; check the seller’s terms. | Not stated in the cited material; check the seller’s terms. |
| Performance or durability advantage | Not established in the cited material. | Not established in the cited material. |
Could a failing spider cause your symptoms?
GM bulletin 99066G says deposit buildup on SCPI poppet valves may contribute to a Service Engine Soon light, misfire, rough idle, or hard start in the specifically covered vehicle population. Those symptoms are not proof that the injector assembly is faulty; ignition, fuel delivery, vacuum leaks, and other issues can produce similar problems. Follow vehicle-specific diagnostic procedures and verify the cause before replacing the spider.
Rank #2
- 【FJ504 Replace Part Numer】fj504 Upgraded Spider Fuel Injector Assembly: 19210687; Fuel Injector Motor: 17113274; Replace: FJ10566, FJ504, FJ105, 93441235, 17091626, 17114163, 17115381, 25340347, 2173029, 217-3029, 4G1888, 16970, 63886, 238887, 89060440, 833221028, 800-1513N, M1046, Spider Injectors come with installation instructions
- 【Confirmed Fit Chevy】FJ504 Spider Injectors 5.7 Vortec chevy for 5.0L 5.7L V8 Engine compatible with 1996 1997 1998 1999 2000 Chevrolet C1500 C2500 C3500 | 1996 1997 1998 1999 2000 2001 2002 Chevrolet Express 1500 2500 3500 | 1996-1999 Chevrolet K1500 K2500 K3500 Truck | 1996-1999 Chevrolet P30 | 1996-1999 Chevrolet Suburban C1500 C2500 K1500 K2500 | 1996-2000 Chevrolet Tahoe
- 【Confirmed Fit】Automotive Replacement Fuel Injectors for 1996-2000 GMC C1500 C2500 C3500 Truck | 1996-2000 GMC K1500 K2500 K3500 Truck | 1996-1999 GMC P3500 | 1996-2002 GMC Savana 1500 2500 3500 | 1996-1999 GMC Suburban C1500 C2500 K1500 K2500 | 1996-2000 GMC Yukon | 1999-2000 Cadillac Escalade | 1996-2000 Isuzu NPR V8 5.0L 5.7L
- 【Function】High Quality Fuel injectors can effectively prevent fuel exposure, reduce fuel waste, improve fuel utilization, and minimize stickiness during use.There is a bracket in our package. Please be sure to fix the bracket on the injector before installing the injector. It can prevent other problems such as oil leakage
- 【Customer Service】 We offer 12 months product quality support service. This FJ504 Injector comes as shown in the picture, Please read carefully before purchasing. If you are uncertain about the item, feel free to contact LOREADA for confirm
The bulletin’s historical scope is limited to California-registered vehicles with YF5 emissions in specified 1996–2002 S/T, M/L, C/K, G, P, and W4/NPR applications, plus specified 2003 NPR vehicles, with listed 4.3L, 5.0L, and 5.7L engine variants. It includes the L31/VIN R 5.7L among those applications. Its special-policy terms describe replacing the SCPI assembly with MFI if injector cleaning had already been performed. This is not evidence of current warranty coverage, nor does it apply automatically to every 5.7L Vortec. Check the bulletin for the exact covered population and conditions.
What to verify before ordering
- Identify the vehicle precisely. Confirm model year, make and model, engine RPO or VIN engine code, and emissions configuration. Do not assume that “5.7L Vortec” alone defines the correct assembly.
- Cross-check the complete application. Ask the seller or check a current parts catalog using the VIN. Confirm that the listed assembly is the MFI/MPFI service assembly intended for that exact configuration.
- Check whether it is new or remanufactured. Compare the product’s condition, included components, warranty, and return terms rather than treating all assemblies with similar listing names as equivalent.
- Confirm seals and adjacent parts. A supplier recommends replacing intake gaskets and the fuel filter during the job. Check whether the assembly kit already includes plenum or intake gaskets, and verify the fuel-filter application for your vehicle before buying either item separately. See the supplier’s GM V8 MFI information.
- Get vehicle-specific service instructions. The cited material does not establish a complete installation procedure, torque specifications, pressure-relief steps, or a universal tool list. Use service information for the exact vehicle and engine; do not substitute generic instructions for those details.
Does the old GM policy affect a repair today?
No current coverage conclusion follows from the historical policy. GM’s bulletin concerns a defined set of vehicles and conditions, while a Canadian bulletin reproduction describes district service-manager approval for Canadian dealers replacing a CSFI unit with MFI under warranty. That is historical warranty administration, not a present-day restriction on an owner-paid repair. Review the reproduced GM of Canada bulletin 00-06-04-003B.
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Quick Recap
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- Fitment 1： This Spider Fuel Injectors 8 Cylinder is fit for fit for Chevrolet C1500 1996-2000; fit for Chevrolet C2500 1996-2000; fit for Chevrolet C3500 1996-2000; fit for Chevrolet Express 1500 1996-2002; fit for Chevrolet Express 2500 1996-2002; fit for Chevrolet Express 3500 1996-2002; fit for Chevrolet K1500 1996-1999; fit for Chevrolet K2500 1996-1999; fit for Chevrolet K3500 1996-1999; fit for Chevrolet P30 1996-1999; fit for Chevrolet Suburban C1500 1996-1999; fit for Chevrolet Suburban C2500 1996-1999; fit for Chevrolet Suburban K1500 1996-1999; fit for Chevrolet Suburban K2500 1996-1999; fit for Chevrolet Tahoe 1996-2000.
- Fitment 2： The spider injectors 5.7 vortec is fit for fit for GMC C1500 1996-2000; fit for GMC C2500 1996-2000; fit for GMC C3500 1996-2000; fit for GMC K1500 1996-2000; fit for GMC K2500 1996-2000; fit for GMC K3500 1996-2000; fit for GMC P3500 1996-1999; fit for GMC Savana 1500 1996-2002; fit for GMC Savana 2500 1996-2002; fit for GMC Savana 3500 1996-2002; fit for GMC Suburban C1500 1996-1999; fit for GMC Suburban C2500 1996-1999; fit for GMC Suburban K1500 1996-1999; fit for GMC Suburban K2500 1996-1999; fit for GMC Yukon 1996-2000; fit for Cadillac Escalade 1999-2000; fit for Isuzu NPR 1996-2000;
- OEM Number Replacement: Our Fuel Injectors is replaces the following number:217-3029, FJ504, FJ10566, 25340347, 17114163, 89060440, 2173029, 93441235, 17115381. Please confirm the part number of the engine assembly before purchasing
- Installation Notes & Important Disclaimers: Professional installation is recommended. Not a universal injector. Vehicle compatibility depends on engine configuration and fuel injection system. Fuel pressure and system condition should be checked before installation to avoid misdiagnosis.
- Built For Reliable Fuel Delivery: Manufactured with durable materials to support consistent fuel atomization under normal engine operating conditions. Intended as a stock replacement, not a performance upgrade.
Rank #4
- High-Performance: These Spider Fuel Injectors are specifically designed for 5.7L V8 engines.It is a multi-port fuel injection replacement that is designed to meet or exceed OEM specifications for fuel volume per millisecond and fuel injector spray angle and pattern. It also has nozzles designed for optimum fuel atomization for increased performance and fuel economy
- Compatibility: Compatible with various Chevy models, including C1500 C2500 C3500 K1500 K2500 K3500 Truck, Express 1500 2500 3500 Van , P30 , Suburban C1500 C2500 K1500 K2500
- Fitment: Also fits GM-C models such as C1500 C2500 C3500 K2500 K3500 K1500 K2500 Truck, P3500 , Savana 1500 2500 3500 Van , Suburban C1500 C2500 K1500 K2500. Additionally, it works for Ca-dillac Escalade
- OEM Numbers: 25340347, 17114163,17115381, 89060440, 2173029, 93441235, FJ10566, 4G1888, 63886, FJ105, FJ504, 16970, 238887, 833-22105-8
- Interchange Part Numbers: 833221058, 833-22102-8, 833221028, 800-1513N,8001513N, M1046, 217-3029, 2173029, 10725, 19210687
Rank #3
- Fitment(Chevy):FJ504 Spider Injectors 5.7 Vortec chevy 5.0L 5.7L V8 Engine compatible with 1996 1997 1998 1999 2000 Chevrolet C1500 C2500 C3500 | 1996 1997 1998 1999 2000 2001 2002 Chevrolet Express 1500 2500 3500 | 1996-1999 Chevrolet K1500 K2500 K3500 Truck | 1996-1999 Chevrolet P30 | 1996-1999 Chevrolet Suburban C1500 C2500 K1500 K2500 | 1996-2000 Chevrolet Tahoe
- Fitment(Chevy):FJ504 Spider Injectors compatible with 1996-2000 GMC C1500 C2500 C3500 Truck | 1996-2000 GMC K1500 K2500 K3500 Truck | 1996-1999 GMC P3500 | 1996-2002 GMC Savana 1500 2500 3500 | 1996-1999 GMC Suburban C1500 C2500 K1500 K2500 | 1996-2000 GMC Yukon | 1999-2000 Cadillac Escalade | 1996-2000 Isuzu NPR V8 5.0L 5.7L
- OEM: FJ504,89060440，25340347，17114163，17115381，217-3029，2173029，93441235，FJ105，FJ10566，4G1888，16970，63886，833-22102-8，833221028，238887
- After-sales service:We provide 1 years after-sales service and a replacement for any product quality issues. If you have any problem, you can contact us
Product prices and availability are accurate as of the date/time indicated and are subject to change. Any price and availability information displayed on Amazon at the time of purchase will apply.
