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Old 01-02-2013, 11:46 AM
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Originally Posted by Richiehd View Post
Thought I read somewhere, castings were too thin to drill. Besides, early heads, no hardened seats.
If the seats are still in decent condition and not sunk too far you probably don't even need hardened seats, on a well tuned mild build non hardened seats have proven to last just fine- I wouldn't mess with that unless it needs it.
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