The best options for Square Body LS swaps combine fuel delivery, engine mounting, and adapter expertise to simplify installation. This guide highlights five Amazon products that are well-suited for 1973–1991 C/K, C10, C20, K10, and related OBS trucks, helping you choose the right parts for your EFI or LT-powered LS/LT swap. Each product is chosen for reliability, compatibility, and clear install paths. This guide targets builders seeking a solid, install-ready setup and avoids unnecessary customization.
Summary table of selected products:
- Fuel Pump Hanger (58 psi) with Sender — Lanotech: Direct-fit, eliminates in-tank splices, best for reliable fuel delivery in Square Body swaps.
- LS Swap Motor Mounts — Goopool: Adjustable, fits 2WD/4WD, supports many transmissions, ideal for engine placement control.
- Fuel Pump Hanger & Sending Unit (450LPH) — Lanotech: High-flow option for higher horsepower builds, maintains factory-fit feel.
- Coolant/Oil Sensor Adapters — Larlansz: Aluminum adapters for LS engine sensors, simple substitution in swaps without fabricating sensors.
- ICT Billet Engine Swap Plate — ICT Billet: Universal swap plate with precise fitment for aligning LS crankshaft centerline.
Fuel Pump Hanger With Sender for 1973-1991 LS/LT Swap
Best for: Square Body pickups that need a reliable, pre-wired fuel delivery system during an EFI LS/LT swap. This unit is designed to work with LS/LT swaps and eliminates the need for splices inside the fuel tank, reducing potential failure points.
Why selected: It fits 58 psi systems and provides a sender included unit, simplifying wiring and fuel delivery. The product is positioned for Square Body trucks such as C10, K10, C20, K20, and other 1973–1991 models.
Caution: Ensure your tank and line routing match the 58 psi specification to avoid fuel pump strain or backpressure issues.
LS Swap Engine Mounts for 1973-1998 Square Body
Best for: Builders needing adjustable engine mounting for Square Body trucks, with compatibility across multiple LS engine variants and transmissions. Suitable for 4L60E, 4L65E, TH-series transmissions and automatic swaps.
Why selected: The mounts are described as adjustable with slotted design, enabling precise engine placement. They support common LS engines (LS1, LS2, LS3, LS6, LS7, LS9) and late Vortec truck engines, covering a wide swap spectrum.
Caution: The description lists many models; confirm your exact engine and transmission combination fits the mounting slots before ordering.
450LPH Fuel Pump Hanger With Sending Unit for 73-91 Square Body
Best for: Higher horsepower LS/LT builds in C/K and Square Body models where higher fuel demand is anticipated. Designed as a direct-fit upgrade for 1973–1991 models.
Why selected: It offers a 450LPH pump suitable for high-performance swaps, with compatibility for E85 and gasoline. The design emphasizes a no-modification approach to the factory tank, simplifying installation.
Limitation: While high-flow, the unit is contingent on compatible fuel system components and wiring harnesses within your swap plan.
M12 to 3/8 NPT Sensor Adapter Kit for LS Swaps
Best for: Projects needing sensor and thread adapters to fit LS sensors into non-LS blocks or swapped platforms. Useful when adapting coolant temperature or oil pressure sensors during a swap.
Why selected: Aluminum adapters with NPT compatibility provide straightforward sensor substitutions, reducing fabrication steps during installation.
Caution: Verify the correct port size and thread type for your specific LS engine generation to avoid mismatches.
ICT Billet SBC Vehicle to LS Engine Swap Plate
Best for: Builders who need a universal swap plate to reposition the LS crankshaft centerline and achieve precise alignment in a variety of vehicles, including Square Body platforms.
Why selected: The plate uses OEM-style specifications and is designed in the USA with 3/8″ billet aluminum, offering a solid base for engine alignment and mounting. It’s a versatile option for custom swap projects.
Limitation: Universal plates may require additional custom fabrication for perfect fit in non-standard engine bays or frame rails.
Buying Guide: Key Factors for a Square Body LS Swap
- Compatibility: Confirm engine type (LS/LT) and transmission match your chosen mounts or adapters. Square Body trucks have varied engine bays and frame configurations; verify fitment with your specific model year and trim.
- Fuel System: Choose a fuel pump hanger with the appropriate flow rate and psi rating for your horsepower goals. Direct-fit options reduce in-tank splices and solder connections, increasing reliability.
- Engine Mounts: Adjustable mounts help control engine placement and drivetrain alignment. Consider compatibility with the intended transmission (automatic or manual) and accessory clearance.
- Sensor adapters: Sensor adapters and plates simplify the transition from traditional small-block setups to LS engines. Aluminum adapters are light and durable, but ensure port sizes and thread types match your sensors.
- Installation Path: Some parts are designed for minimal modification; others require more fabrication. Evaluate whether you prefer plug-and-play assemblies or custom fabrication to achieve optimal fit.
- Fuel Tank and Wiring: Verify that any fuel pump upgrade integrates cleanly with the factory tank and stock wiring harness. No-modification tank compatibility can save time and reduce risk.
- Future-Proofing: If you plan high-performance LS builds, prefer higher-flow fuel pumps and robust mounts that tolerate increased engine output and aggressive tuning.
Frequently Asked Questions
- What is the main advantage of a square body LS swap kit?
It standardizes fuel delivery, engine mounting, and sensor adaptation for a reliable swap in classic trucks. - Do these parts require professional installation?
Some steps can be DIY-friendly, but engine swaps frequently benefit from professional wiring, alignment, and exhaust work. - Is an adjustable engine mount always necessary?
Not always, but adjustable mounts help accommodate various transmissions and engine placements for proper clearance and driveline alignment. - Can these fuel pump hangers be used with non-LS engines?
The listed hangers are designed for LS/LT swaps; using them with non-LS engines is not recommended unless explicitly stated by the manufacturer. - Will I need additional brackets or adapters beyond these products?
Depending on your vehicle and swap plan, you may need exhaust, steering, and accessory brackets beyond the products listed here. - Do these parts affect fuel tank integrity?
Direct-fit designs minimize modification to the tank, reducing risk of leaks or failure due to splices inside the tank.