Yoursme LS Swap Adapter Plates — Billet Aluminium SBC-to-LS, 4-Position Adjustable with Hardware

If you're converting an SBC/BBC-equipped chassis to run any common LS-family engine (LS1, LS2, LS3, LQ4, LQ9, LS6, L92, L99, L33, LR4), these adapter plates bridge the gap between the factory small-block mounting points and the LS engine's mounting pattern. Engine swaps often require precise fitment to avoid interference with headers, oil pans, steering components, or to preserve driveline geometry. These plates are machined to OEM-style dimensions, raise the crank centerline by 0.17 inches, and include the fasteners needed for installation so you can focus on mock-up and alignment rather than fabrication.

How do these adapter plates simplify an LS swap?

The plates use the existing small-block Chevy frame mounts, allowing the LS engine to bolt in without custom motor plates or major frame modification. Each plate has a milled recess to clear the hump on SBC/BBC mounts so no grinding of factory mounts is required for a flush fit. Because they are CNC-machined, the bolt patterns and hole spacing are consistent and repeatable for easier installation.

• Directly bolts to existing SBC/BBC motor mount locations
• Milled center opening clears mount hump—no grinding needed
• Raised crankshaft centerline: +0.17" for improved fitment
• Includes M10-threaded plates and matching bolts for a complete kit

Which engines and vehicles are compatible with these brackets?

These adapter plates are designed for a wide range of common LS-series engines (including LS1, LS3, LS2, LQ4/LQ9, LS6, L92, L99, L33, LR4) and fit vehicles that originally used small-block Chevy (SBC/BBC) mounts. The four-position adjustability gives room to accommodate different oil pans, header clearances, and steering or crossmember layouts. Still, always verify clearances with your specific engine and chassis before final installation.

• Fits popular LS-family engines (LS1/LS2/LS3/LQ4/LQ9, etc.)
• Works with vehicles originally equipped for SBC/BBC mounts
• Four adjustable plate positions to clear headers and pans
• Recommended: test-fit for unique aftermarket components

What hardware and build quality come with the kit?

The kit arrives complete: two CNC-milled aluminum adapter plates, eight flat-head bolts, and six M10-1.5 flange bolts to thread into the plates. The plates are precision machined to OEM-like dimensions for repeatable alignment and long-lasting fit. Billet aluminum construction keeps weight down while maintaining rigidity and corrosion resistance compared to cast or stamped alternatives.

• 2 adapter plates CNC-milled from billet aluminum
• 8 flat-head bolts and 6 flange M10-1.5 bolts included
• M10-threaded plates match supplied hardware—no extra fasteners required
• Durable finish and precise machining for consistent fitment

Will installation require special tools or modifications?

Basic hand tools and a jack or engine support are usually sufficient for installation, and the milled center opening removes the need to grind factory mount humps for a flush fit. Depending on your vehicle, you may need to adjust engine position, modify mounts, or test-fit headers and oil pans—those steps are common to most engine swaps. If you’re uncomfortable with alignment or driveline angles, consult a professional installer.

• No grinding of factory mounts required thanks to milled recess
• Typical tools: sockets, torque wrench, engine support or hoist
• May require mock-up and clearance checks for headers and pans
• Professional alignment recommended for complex swaps

Who is this for: These adapter plates are aimed at DIY mechanics, professional shops, and classic-car restorers performing LS conversions into SBC/BBC-equipped frames. They suit builders who want a precision, repeatable solution without custom-fabricated motor mounts—particularly when preserving original chassis mount points and minimizing frame alterations is a priority. If you need adjustable clearance options and a complete hardware kit, the Yoursme adapter plates simplify setup and reduce fabrication time.