Concentricity of your valve seats and guides is a critical tolerance that must be controlled for performance and longevity of your engines valve train.

As always, proper preparation with cylinder head machining, and reaming your guides prior to cutting your seats, will guarantee the best results.

The Rottler SG9MTS makes this a quick and easy step. This simple operation can be performed in minutes right on the machine prior to cutting the seats. With the optional Collet Kit R1, any reamer for any size guide can be used on the machine.