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Old 11-06-2009 | 12:07 PM
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Jeff Worsham
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From: Saratoga Springs, UT
Default RE: new old classic pattern engine

What years were the HP .61's used most? I've got one NIB and would like to put it on a "period correct" airfame. Seems to me early to mid 70's but can't remember for sure as I was pretty young then.