Piston Dome Micrometer, Valve Angle Comparator

It Is Very Critical That The Valve Relief In The Piston Is The Same Angle As The Valve In The Head, Especially On High RPM Applications Where Piston To Valve Clearance Is At A Minimum.

If You Float The Valves And They Hit the Piston Squarely, Usually Very Little Damage Is Incurred. However, If You Hit The Piston With The Edge Of The Valve, It Will Always Bend The Valve And Many Time Will Break The Valve Head Off; A Disaster At High RPM.

You Can't Take For Granted That The Existing Angle On The Piston Is Correct, Particularly After Angle Milling, Etc.

This Tool Is Simple To Use And A Lot Less Time Consuming Than Clay

First, Set The Tool On The Cylinder Head To Get The Valve Angle

Lock Tool At This Angle And Set The Fixture On The Piston To Check Piston Relief Angle