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The HDPC shop journal

Engine guidance and news from the shop.

Valve Job 101: What “3-Angle Cut” Actually Means for Sealing

Introduction If you’ve ever seen “3-angle valve job” or “3-angle cut” listed on a cylinder head rebuild sheet, it’s not shop jargon—it’s a precision machining step that directly affects how well your valves seal, how stable compression stays, and how efficiently the head moves air. Some people treat it like a “nice-to-have.” In reality, a […]

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