Mejiao LS Swap Motor Mount Adapter Plates — Billet Aluminium Small‑Block Kit, CNC‑Milled 0.17in Rise

Mejiao LS Swap Motor Mount Adapter Plates are CNC‑milled aluminum brackets that let you bolt most LS‑series engines into vehicles originally fitted with small block Chevy engines. Upgrading to an LS engine often means adapting engine mounts and aligning the crankshaft properly — this kit addresses both. These adapter plates are manufactured to OEM dimensions, CNC machined for precision, and supplied with the fasteners needed for installation. They raise the crank centerline by approximately 0.17 inches where required and include milled center openings so the plates sit flush without grinding or modification.

How do these adapter plates fit different LS engines?

The plates are designed to accept a wide range of Gen III/IV LS family engines (LS1, LS2, LS3, LS6, L92, L99, LQ4, LQ9, L33, LR4) and pair to SBC/BBC style mount points on the chassis. Threaded M10 holes and included bolts match common hardware standards for straightforward mating.

• CNC‑milled to OEM mounting locations for reliable alignment
• M10 threaded plates accept the supplied flange and flat head bolts
• Compatible with many LS variants without custom bracket fabrication

Will I need to modify my existing mounts or chassis?

No grinding or trimming is required for a flush fit — the center of the plate is recessed to clear the hump on SBC/BBC motor mounts. This reduces labor and preserves the original mount geometry, making installation cleaner and faster.

• Milled opening clears rear mount hump for flush seating
• No chassis welding or plate reshaping typically needed
• Designed to maintain original mount footprint and bolt pattern

What materials and hardware come with the kit?

The adapter plates are fabricated from billet aluminum using CNC machining for consistent, repeatable accuracy and reduced weight. The package contains the plates plus all necessary bolts so you have a complete set for installation.

• Two CNC‑milled billet aluminum adapter plates
• Eight flat head bolts and six M10‑1.5 flange bolts included
• Plates are M10 threaded to accept included fasteners

How does this change engine placement and drivability?

These brackets reposition the crankshaft centerline upward by about 0.17 inches compared with many small block setups, which can help clear chassis components and optimize angle relationships for accessories and driveline parts. They are engineered to maintain secure, repeatable mounting while accommodating LS dimensions.

• 0.17" crank centerline rise to improve clearance and alignment
• Preserves solid mount contact and stress distribution
• Helps simplify header, steering, and transmission fitment planning

Who is this for These adapter plates suit DIY installers, professional shops, and restorers doing LS conversions on vehicles originally built for small block Chevy engines. If you want a precision‑machined, bolt‑on solution that minimizes chassis modification and includes the necessary hardware, this kit from Mejiao offers a complete, OEM‑spec option backed by a 180‑day warranty. It's ideal when you need accuracy, repeatable fitment, and parts that simplify the swap process without fabricating custom brackets.

FAQ

Q: Are these plates compatible with LS1 and LS3 engines?

A: Yes. The Mejiao plates accept many Gen III/IV LS engines including LS1 and LS3 using standard M10 mounting hardware.

Q: Do I need to modify motor mounts to install them?

A: No grinding is required; the plates have a milled center opening to clear SBC/BBC mount humps for a flush fit.