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Non Metallic Firewall Washers

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Sikorsky

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Joined
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I have recently talked to some really smart cub people and nobody has had a definitive answer to this. The J3 originally had non metallic flexible washers between the engine mount and firewall. Why would Piper do this on the J3? The Supercubs never had this. The CC Top Cub does do this. Why?

Sikorsky
 

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