[Vwdiesel] NA exhaust valves for a TD head?

Tim Hicks emailastro at yahoo.com
Thu Apr 7 13:11:34 EDT 2005

The non-turbo head is cast in aluminum-alloy. The Turbo has a stronger, sodium-injected alloy. Different materials are also used for the Turbo's valve seats, the pre-chambers and the turbo’s valves made of a special metal called Resistal and the exhaust valves are reinforced by a plasma spray during manufacturing process.

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