Canyon Exhaust Valve Guide Oversize for Porsche

Canyon exhaust valve guides in oversize dimensions are made for rebuilding the cylinder heads of air-cooled Porsche 911 engines. The valve guide is a cylindrical sleeve pressed into the cylinder head. It holds the exhaust valve in position so the valve closes squarely on its seat. Oversize guides, also called replacement-size valve guides, are used when the original guide bores are worn or have been machined during a head refurbishment.

Key Features:

• Exhaust-side valve guide in an oversize outer diameter for refreshed or re-machined guide bores
• Helps keep the valve stem-to-guide clearance correct. Too much clearance can cause poor valve seating, lost power and higher oil consumption, and too little can make valves stick
• Replaces worn guides to help restore valve control and reduce valve play
• Designed for engine builders and professional cylinder-head rebuilds
• Sold under the Canyon brand, a well-known supplier of replacement engine parts for Porsche

Replacing worn exhaust valve guides during a cylinder-head rebuild helps the valve train work as it should. Pair them with correctly sized valves and a proper valve seat job for best results.