Thread: 389 rebuild - bore size
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Old 12-16-2002, 08:02 AM
khogan khogan is offline
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Join Date: Sep 2002
Location: Colorado
Posts: 60
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Hobby,
What causes the valve clearance issue when boring to .090 over? Or is it the use of the 400-.030 pistons?

I want to keep the 389 heads - They are ported and built.

Ken

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