Operation CHARM: Car repair manuals for everyone.
Manuals through 2025 now available!

Our trusted friends have launched a new website named LEMON, which has newer manuals. It also contains all the CHARM manuals.

LEMON is the spiritual successor to CHARM, I recommend you try it!

Link: lemon-manuals.la or lemon-manuals.org.ua

(Some people have issue connecting. LEMON is investigating. For now, use Firefox or change your DNS server)

Or, hide this message: temporarily or permanently

Valve Seat

Valve Seat Width:
Intake and Exhaust 1.5 - 2.0 mm (0.06 - 0.08 inch)
Angle 45°
Runout (T.I.R.) 0.076 mm (0.003 inch)
Bore Diameter:
Insert Counterbore Diameter 47.097 mm (1.8542 inch) Maximum
Intake 47.072 mm (1.8542 inch) Maximum
Exhaust 39.730 mm (1.5645 inch) Maximum