请稍候… 
我们正在处理您的订单，请稍候
请不要按返回按钮…
请不要按返回按钮…
在此输入您的增值税号，然后单击验证：
您的详细信息已经过验证。增值税号注册至：
,
。
现在，您的订单的增值税税率为零。我们保留在您提出订单请求后验证这些详细信息的权利，并在需要时恢复增值税。
您的增值税详细信息无法识别或无效。您的增值税号必须与上面指定的帐单国家/地区相匹配。当前指定为 。您无需输入增值税号的国家/地区代码部分，因为已在上面的帐单地址详细信息中选择了该部分。
增值税号查询服务目前已离线。请在下面的评论或特殊说明字段中提供您的增值税详细信息，我们将在您提出订单请求后应用增值税折扣。
Exhaust valve guide 1st oversize, SET OF 6. Porsche 993 1994-98 - 99310432172
99310432172/1KIT
产品车辆组
- Porsche 993 (911) C2 1994-97
- Porsche 993 (911) C4 1994-97
- Porsche 993 (911) RS 1994-97
- Porsche 993 (911) C2S 1994-97
- Porsche 993 (911) C4S 1994-97
Information
Exhaust valve guide - 1st oversize - set.
This is a set of six OE Match quality exhaust valve guides designed for the air-cooled Porsche 911 (993) engines produced between 1994 and 1998. These are 1st oversize valve guides, meaning they are slightly larger than standard guides to accommodate engines that have been reamed or show wear in the original guide bores. The set contains six guides, enough for a full cylinder head rebuild on the exhaust side.
SET OF 6
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 2.
Valve guides are precision metal bushings pressed into the cylinder head that support and guide the movement of the exhaust valve stems. Over time, original guides can wear, allowing excessive valve stem play, reducing seal effectiveness, and increasing engine oil consumption. These OE Match valve guides are manufactured to match Porsche’s original specifications, including diameter, material quality and machining tolerance, but in a 1st oversize dimension so they fit reamed cylinder heads.
This SET OF 6 provides a complete set for one engine’s exhaust side - ideal for cylinder-head rebuilds, valve jobs or whenever the exhaust guide bores are undersized due to wear.
The exhaust valve guides:
• Support and align the exhaust valve stems so they travel accurately within the head.
• Maintain correct valve seating and combustion sealing, which is vital for performance and compression.
• Help conduct and dissipate heat from valves into the cylinder head casting.
• Reduce lateral valve stem movement, decreasing wear on stems and valve seats.
By replacing old or worn guides with a matched oversize set, you can restore tight tolerances in the valve train and help ensure efficient combustion and long-term reliability.
Valve guides wear over time due to heat, friction, and repeated valve movement. When guides become worn or oversized gaps develop between the valve stem and guide bore, the following issues can arise:
• Loss of performance and power
• Higher oil consumption
• Reduced sealing and compression
• Increased valve train wear
Installing a correct OE Match valve guide restores correct valve alignment, reduces unwanted movement, supports proper seat sealing, and prolongs the life of your engine’s top end - especially in rebuild or high-mileage applications.
Replace valve guides if you observe:
• Blue smoke from the exhaust (signifying oil burning)
• Rough idle or hesitation
• Poor compression or loss of engine power
• Valve stem play when checked during teardown
• During a cylinder head rebuild or valve job
相关参考编号
相关编号、被取代编号、交叉引用编号或替代编号，供比较之用。
99310432172
您正在查看的产品与这些编号存在交叉引用关系
This is a set of six OE Match quality exhaust valve guides designed for the air-cooled Porsche 911 (993) engines produced between 1994 and 1998. These are 1st oversize valve guides, meaning they are slightly larger than standard guides to accommodate engines that have been reamed or show wear in the original guide bores. The set contains six guides, enough for a full cylinder head rebuild on the exhaust side.
SET OF 6
Fits:
Porsche 993 1994 - 1998
Diagram Ref no 2.
Valve guides are precision metal bushings pressed into the cylinder head that support and guide the movement of the exhaust valve stems. Over time, original guides can wear, allowing excessive valve stem play, reducing seal effectiveness, and increasing engine oil consumption. These OE Match valve guides are manufactured to match Porsche’s original specifications, including diameter, material quality and machining tolerance, but in a 1st oversize dimension so they fit reamed cylinder heads.
This SET OF 6 provides a complete set for one engine’s exhaust side - ideal for cylinder-head rebuilds, valve jobs or whenever the exhaust guide bores are undersized due to wear.
The exhaust valve guides:
• Support and align the exhaust valve stems so they travel accurately within the head.
• Maintain correct valve seating and combustion sealing, which is vital for performance and compression.
• Help conduct and dissipate heat from valves into the cylinder head casting.
• Reduce lateral valve stem movement, decreasing wear on stems and valve seats.
By replacing old or worn guides with a matched oversize set, you can restore tight tolerances in the valve train and help ensure efficient combustion and long-term reliability.
Valve guides wear over time due to heat, friction, and repeated valve movement. When guides become worn or oversized gaps develop between the valve stem and guide bore, the following issues can arise:
• Loss of performance and power
• Higher oil consumption
• Reduced sealing and compression
• Increased valve train wear
Installing a correct OE Match valve guide restores correct valve alignment, reduces unwanted movement, supports proper seat sealing, and prolongs the life of your engine’s top end - especially in rebuild or high-mileage applications.
Replace valve guides if you observe:
• Blue smoke from the exhaust (signifying oil burning)
• Rough idle or hesitation
• Poor compression or loss of engine power
• Valve stem play when checked during teardown
• During a cylinder head rebuild or valve job
相关参考编号
相关编号、被取代编号、交叉引用编号或替代编号，供比较之用。
99310432172
9931043217
99310432170
99310432171
99310432172
您正在查看的产品与这些编号存在交叉引用关系
关于此套件
该套件包括以下商品:
6 x 排气门导管（第一级加大尺寸）。适用于保时捷 993（1994-98 年款）。 (99310432172/1
价格: €111.36
库存