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9 Before Mike assembled the heads, he cut (30-deg.) and back-cut (45-deg.) the stock valves, and performed a quality four-angle valve job on the seats. Intake: 38, 45, 60 and 70-degrees. Exhaust: 36, 45, 60, and 70-degrees. The 36-degree opening angle on the exhaust improves low-lift numbers. View Related Article
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