Speedmaster 1-539-001 LS 4-Bolt 102mm to LS1 85mm 3-Bolt Throttle Body Adapter

The Speedmaster 1-539-001 throttle body adapter is designed to bridge the gap between a 4-bolt 102mm throttle body and a 3-bolt LS1 85mm intake manifold, allowing you to upgrade your throttle body without replacing your existing intake. This adapter simplifies the swap process and helps unlock improved airflow potential on LS-based builds.

Engineered for LS platform applications, this adapter provides a straightforward bolt-on solution for enthusiasts looking to run a larger 4-bolt 102mm throttle body on a 3-bolt LS1-style manifold. A practical and cost-effective upgrade for street and performance LS engine builds.