Valve Chart
NOTES:
- Dimensions are in inches, unless stated in millimeters
- Stem length measured from inner edge of ground face to tip of stem
- Seat angle 45° for all except Minor, which is 60°
- Tranco part numbers are usually stamped on the stem next to the collet groove
- James part numbers usually cast proud on the surface of the head, often with the letters “VK+”
Collet groove types are as shown below: