Thread: 239 bore.
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Old 04-30-2017, 09:38 PM   #5
WestCoast
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Join Date: Sep 2014
Location: oroville calif
Posts: 893
Default Re: 239 bore.
a 239 stock engine is 3 3/16" inch bore (3 /.187") using hasting steel vent rings I have gone way past the books engine tolerance specs, ran strong and no smoke, good for around 40,000 miles
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