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$900 isn't bad considering the oversized SS valves, new springs and retainers and the extrude honing, with port matching. Custom machine work is never cheap, and unless there is a stock app. for these OS valves they will be fairly $pendy too. William bought 1mm OS intake valves a while back. What was the $$ on them?
I'd say it' not a bad deal considering you pay $400-$500 for a head rebuild and minor port work in the bowls, new springs and retainers, and a 3 angle valve job.

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