Valve guide exhaust / inlet standard size. Porsche 911 1965-89 OE Ref: 93010432100

This is the standard valve guide used in early air-cooled Porsche 911/930 cylinder heads. It’s a plain (non-hydraulic) guide that locates the valve stem in the head; when worn it causes oil burning, loss of compression and poor valve seating — so they’re commonly replaced whenever heads are rebuilt.

What the part is (technical data / dimensions)

• Fits:
• Porsche 911 1965-1968 2.0L / 912 SWB (F)
• Porsche 911 1968-1973 2.2L / 2.4L / 2.7L RS LWB (F)
• Porsche 911 1974-1977 2.7L / 1976-77 3.0 Carrera
• Porsche 911 1978-1983 3.0L / SC
• Porsche 911 1984-1986 3.2L
• Porsche 911 1987-1989 3.2L G50
• Porsche 911 1975-1977 3.0L Turbo (930)
• Porsche 911 1978-1989 3.3L Turbo (930)

Why these guides should be replaced

• Valve guides are a wearing item. Replace them when any of the following occur or when you rebuild the engine head.
• Excessive valve stem play — worn guide ID internal diameter lets the valve rock and misalign with the seat , poor sealing, reduced compression and power.
• Oil consumption / smoking — worn guides allow oil to wick down the stem into the combustion chamber, causing blue/grey smoke and fouled plugs.
• Hard starting, rough idle, misfire — poor sealing / valve timing irregularities from misaligned valves.
• Valve wobble that leads to premature valve stem wear or valve seat damage — once stems or seats are damaged you need deeper surgery.
• If a guide is cracked, broken, or has excessive ovality — must be replaced.
• Whenever you remove and refinish seats / replace springs / do a full head rebuild — replacing guides at that time is cheap insurance and ensures correct alignment. 

Inner diameter 9,00 mm
Outer diameter 13,06 mm
Total Length 51,20 mm

Click 'Zoom in' for large parts diagram.
Diagram Ref No 2 and 2A.