GM TH400 Transmission Billet Aluminum Full Manual 2-Speed Valve Body - Silver if you want more airflow

if you want more airflow then you should grab up one of these Speedmaster X-Stream air flow top plates

and one 3mm spacer

Reducer assemblies allow you to connect various sized exhaust tubing to your header

Speedmaster pushrods are available in both 5/16 in

You can depend on Speedmaster for the quality fuel system hardware that you need

GM TH400 Transmission Billet Aluminum Full Manual 2-Speed Valve Body - Silver if you want more airflowSpeedmaster billet aluminum valve bodies are a direct replacement for your original valve body. These valve bodies shift quickly and incorporate an adjustable pressure regulator. Fully 5 axis CNC machined from billet aluminum, these valve bodies will help your project shed some weight.