How to Ream Valve Guides for PERFECT Seat Concentricity

May 15, 2025
Concentricity! Specifically, concentricity of your valve seats and guides is a critical tolerance that must be controlled for performance and longevity of your engines valve train.

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EM100 SERIES

Heavy duty HARDWARE, cutting edge SOFTWARE.

Machine large blocks like CAT3520, Waukesha 9390, & White Superior 825.

EM69HP

Digitize and Port Heads.

Machine Blocks and make 5 Axis Parts with 4C CAD/CAM/CNC/CMM software.

SG Series

Valve Seat & Guide Machinery - CNC and manual Valve Job Machines

SG90A

SG9MTS

SG10XY

SG100XY

SG90MTS

EM60 Series

Flexible CNC Machining of Engine Parts, Digitizing, CNC Head Porting and Custom CNC Parts

EM69ATC

EM69HP

H80 Series

CNC Vertical Cylinder Honing Machinery

H85A

H85AX

H85AXY

H87AXY

EM100 Series

Very Large Capacity Multi-Purpose CNC, Boring, Surfacing & Line Boring Machines

EM109H

EM107H

EM103H

EM104H

EM105H

VR Series

Valve Refacing Machines with Centerless Valve Grinding and Linear Roller Bearing Slideways

VR12

F Series

Automatic Boring, Sleeving, and Surfacing (F10XS) CNC Machines

F9A

F10A

F10X

F10XS

S Series

Dry Milling CNC Cylinder Head Surfacing Machines

S85A

S86A

F60 Series

Small-Med Multi-Purpose Boring, Surfacing & Line Boring Machines (CNC)

F69A

EM70 Series

Medium Capacity Multi-Purpose Boring, Surfacing & Line Boring Machines (CNC)

EM79

EM79ATC