Valve Guides

Remove cylinder head as previously described.
Using suitable compressor (J-8062) remove valve retainers, springs, and caps. Disengage compressor and remove valve. Scrape all carbon from chambers, piston heads and valves.

Inspect valve guides for wear or pitting. Imperfections can be reamed to fit oversize stems.

NOTE: Always check valve stem diameter because oversize valves may have been installed at factory.

Valves are marked at stem end. Valve guides are available in three oversizes:

VALVE GUIDE OVERSIZES

Oversize

Valve Guide Dia.

Valve Stem Dia.

.0030" ⁽¹⁾

Intake

.2795-.2803"

.2785-.2789"

Exhaust

.2795-.2803"

.2778-.2781"

.0059" ⁽²⁾

Intake

.2825-.2833"

2815-.2819"

Exhaust

.2825-.2833"

.2807-.2811"

.0098" ⁽³⁾

Intake

.2864-.2872"

.2854-.2858"

Exhaust

.2864-.2872"

.2846-.2850"

⁽¹⁾	Oversize identification mark is No. 1.

⁽²⁾	Oversize identification mark is No. 2.

⁽³⁾	Oversize identification mark is Letter A.

Grind valve seat to 45° angle and reface both intake and exhaust valves to 44°. If valve seat is too wide, eliminate excess using a 25° cutting tool. Cut at top of seat. Top of intake and exhaust valves should not be less than 0.040" and 0.060", respectively, above clean combustion chamber.
Lubricate with engine oil and reinstall valves, valve springs, caps and valve retainers.
NOTE: Springs must be installed with closely wound coils toward cylinder head.