Speedmaster LS 4 Bolt 102mm to LS1 96mm 3 Bolt Throttle Body Adapter 1-539-002

The Speedmaster LS 4 Bolt 102mm to LS1 96mm 3 Bolt Throttle Body Adapter (MPN 1-539-002) is a precision engine control component designed to bridge incompatible throttle body bolt patterns during LS engine builds and retrofits. This adapter enables installation of LS1-series throttle bodies (96mm, 3-bolt configuration) onto LS-gen engines that feature the larger 4-bolt 102mm mounting pattern, making it essential for engine swaps, carburetor-to-EFI conversions, and custom fuel injection setups.

The adapter provides a direct mechanical solution for achieving proper throttle body alignment and secure fastening without modification to the intake manifold or throttle body itself. Built by Speedmaster, a trusted supplier of performance engine parts, this adapter maintains factory bolt hole spacing and allows seamless integration of LS1 fuel injection systems or throttle bodies into newer LS platform engines. Ideal for hot rodders, engine builders, and performance enthusiasts undertaking comprehensive engine conversions or modernization projects requiring throttle body compatibility across LS generations.

Key Features & Benefits

• LS to LS1 Conversion: Adapts 4-bolt 102mm LS pattern to 3-bolt 96mm LS1 throttle body mount.
• Engine Swap Ready: Enables fuel injection and throttle body installation during LS engine platform swaps.
• Precision Engineering: Maintains proper bolt hole alignment for secure, leak-free throttle body mounting.
• Direct Fit Solution: No intake manifold or throttle body modification required for installation.
• Performance Applications: Supports carb-to-EFI conversions and multi-generation LS engine builds.

Specifications

Ideal Applications

• LS to LS1 engine swaps and platform conversions
• Carburetor to fuel injection system upgrades
• Custom engine builds requiring multi-generation LS component integration
• Performance engine modifications and modernization projects