How to LS swap a G-body: parts list and steps

Chevrolet G-body (Monte Carlo, El Camino, Cutlass, Regal, Grand Prix) (1978–1988) LS swap: parts and gotchas from our sourced guides.

1978–1988 GM G-body (Monte Carlo, Malibu, Grand Prix, Cutlass, Regal) LS swap: adjustable mounts, controller kit and EFI tank kit (PSI); ICT mount kit also verified.

Fuel: PSI Conversion 78–88 Monte Carlo, 78–83 Malibu & 78–87 Grand Prix EFI Tank Kit ($619.95)

Mounts: PSI Conversion LS Swap Adjustable Engine Mounts (77–90 Caprice/Impala, 82–92 F-Body, 75–79 Nova, 78–88 G-Body) ($124.99)

Wiring/ECU: PSI Conversion 99–07 Gen 3 LS/Vortec (24X) Engine Controller Kit, drive-by-cable, w/ 4L60E-75/4L80E control (standalone harness, MAF, flashed ECM, bracket) ($1,099) (optional)

Watch out for: Carbureted-era tanks need an EFI tank/pump for 58 psi LS fuel pressure (PSI EFI tank kit).

More parts for this vehicle in our catalog (vendor listings, 2026 prices):

• LS Lower Radiator Hose - 1982-1988 Chevy G-Body (ICT Billet, $60)
• LS Upper Radiator Hose - 1982-1988 Chevy G-Body (ICT Billet, $60)
• TR6 High Tech Ignition System for 1986-87 Turbo Buick Grand National V6 (Full Throttle Speed, $524.99)
• LS Engine Mount Kit - G-Body 78-88 (ICT Billet, $260)
• LS/LT Engine Mid Plate - G-Body 78-88 (ICT Billet, $202)
• LS Front Motor Plate - G-Body 78-88 (ICT Billet, $202)

See our engine, oil pan, transmission and wiring guides for choosing the rest of the combination.