V8 Engine Overhaul: Valves, Springs & Guides Inspection
ENGINE
OVERHAUL
7
4. Check cylinder head height at each end of
cylinder head:
Engine numbers without suffix B
A= 23.9 mm (0.94 in) - new
B= 63.5 mm (2.5 in) - new
Engine numbers with suffix B
A= 22.94 mm (0.903 in) - new
B= 62.56 mm (2.463 in) - new
5. Cylinder heads may be refaced:
Reface limit = 0.50 mm ( 0.02 in) from new
dimension.
Valves, valve springs and guides - inspection
NOTE: Two types of exhaust valve may be
fitted - standard valves A in illustration or
carbon break valves - B in illustration.
Carbon break valves may be identified by the
machined profile C on the valve stem. To prevent
exhaust valves sticking, standard exhaust valves
should be replaced with carbon break valves
during engine overhaul.
NOTE: Modified inlet valves, carbon break
exhaust valves and valve guides are fitted
to later engines. The modified exhaust
valves may be identified by measuring the
distance A from the valve head face to the top of
the undercut on the valve stem. Additionally, the
exhaust valves have a black nitrided finish whilst
the inlet valves have a chrome finish.