Before you dive into your LS swap, preparation is everything. From fuel delivery systems and oil pans to mounts, radiators, and wiring harnesses, every part plays a vital role in your truck’s performance and reliability. This guide compiles the ultimate LS swap parts checklist—tailored specifically for C10 owners who want to do it right the first time. With the right setup and trusted suppliers, you’ll be ready to turn your classic into a daily-driven beast that performs like new.

“A clean swap doesn’t start under the hood—it starts on the parts list.”

1. Engine Mounts and Crossmembers

LS engines mount differently than the original small-blocks found in classic C10s. You’ll need a conversion mount kit or adjustable crossmember to align the drivetrain properly. Modern kits simplify the process—no cutting, no guesswork. Look for mounts that use factory frame holes for strength and alignment accuracy.

Recommended category: Engine & Drivetrain

2. Oil Pan and Clearance Components

The LS’s stock oil pan often won’t clear your C10’s crossmember. A rear-sump or swap-specific oil pan ensures proper clearance and oil pickup alignment. Choose one that matches your chassis generation—1960-66, 1967-72, or 1973-87—to avoid steering interference.

Pair it with a high-quality oil filter adapter and low-profile drain plug for maintenance ease.

3. Fuel Delivery System

LS engines demand high-pressure, return-style fuel systems—usually 58 psi. You’ll need an EFI-compatible fuel tank with an in-tank pump or external pump kit, a return line, and a fuel pressure regulator. Upgrade to modern AN fittings to prevent leaks and simplify routing.

Explore: Fuel & Cooling

4. Wiring Harness and ECU

A standalone LS wiring harness is the heart of a reliable swap. It simplifies connections to sensors, injectors, and ignition coils while integrating with your C10’s fuse panel. Choose a pre-labeled, plug-and-play harness designed for your specific engine generation (LS1–LS3, etc.) and ECU style.

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5. Cooling System and Radiator

The LS runs hot when paired with older radiators. Install a high-efficiency aluminum radiator with dual fans and a proper shroud. Don’t forget the upper and lower hoses designed for LS-specific outlets, and ensure you include a steam port connection to bleed air from the heads.

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6. Exhaust and Headers

Tight engine bays call for swap-fit headers or manifolds that clear your frame and steering components. Stainless-steel short tubes are ideal for street builds; long tubes add top-end power. Use quality gaskets and V-band clamps for leak-free longevity.

7. Transmission and Drivetrain

Whether you’re running a 4L60E, 4L80E, or manual T56, verify adapter plates, torque converters, and crossmembers align correctly. Upgrading to a modern overdrive transmission transforms highway manners and fuel economy. Pair with a driveshaft suited to your wheelbase and transmission output.

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8. Suspension, Steering, and Brakes

Extra horsepower deserves extra control. Upgrade your suspension and steering with tubular control arms, coilovers, or drop spindles. On the stopping side, a disc brake conversion with a proportioning valve and modern master cylinder brings your classic up to modern safety standards.

Check Suspension & Steering and Brakes

9. Fasteners, Hardware, and Finishing Touches

Don’t overlook the small parts: ARP bolts, fuel-safe clamps, wiring retainers, and stainless hardware make the difference between a rattling build and a showpiece. Organization here saves hours later when it’s time for maintenance or upgrades.

Stock up at Fasteners & Bolts

Final Checks and First Fire-Up

Before turning the key, double-check fuel pressure, wiring grounds, coolant levels, and torque specs. Prime your oil system, verify firing order, and use a wideband O2 sensor for safe initial tuning. These steps prevent headaches later and ensure your LS-swapped C10 starts strong and stays reliable.