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Old 04-07-2011 | 09:32 PM
  #3  
Gray Beard
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Joined: Apr 2003
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From: Hemderson, NV
Default RE: Firewall thickness

I stick with 1/4 inch all the way up to 1.40s without problems. I use 3/8 with a 40cc gas engine. What plane and engine are you using? The 1.40s I use are both gas and the YS four stroke.