How to Machine Valve Seats – 5-angle Profile on the Rottler SG9MTS

April 28, 2025

Follow along as we demonstrate step-by-step how to cut 5-angle valve seat profiles on the Rottler SG9MTS

Rottler’s Ryan Thompson delivers an in-depth tutorial on how to cut seats and ream valve guides using the Rottler SG9MTS.

The SG9MTS is a seat & guide machine designed for job shops, performance shops and general purpose engine work. The machine features Rottler’s patented Uni-Pilot technology with Manualmatic software, delivering stress-free, precision hole-to-hole machining of Intake and Exhaust Valve Seats on any Cylinder Head.

Starting with a new small block Chevy block from Dart, Ryan walks through the tooling, machine set up and cutting 5-angle valve seat profiles.


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