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Old 16th Apr 2014, 02:50
  #480 (permalink)  
No Hoper
 
Join Date: Apr 2012
Location: Iraq
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Talked to the old bloke here, there was a 7cyl Jacobs radial in the Airtractor. The plate on this R985 indicates is built under license by Jacobs.

I'll take a punt on the exhaust valve question:
A richer mixture
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