Mazda MX-5 Miata Sport 2007 Manual page 34

2007 Mazda MX-5 Miata Sport
2006-08 ENGINE Mechanical - Overhaul - 2.0L (LF) & 2.3L (L3) - Mazda6 & MX-5 Miata
Fig. 34: Positioning Center Of Valve Face
Courtesy of MAZDA MOTORS CORP.
3. Inspect the sinking of the valve seat. Measure the protruding length (dimension L) of the valve stem.
If not specified, replace the cylinder head.

Valve protrusion height (Standard)
IN: 40.64-42.24 mm {1.600-1.662 in}
EX: 40.50-42.10 mm {1.595-1.657 in}