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Topics - tomsfe64

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FE Technical Forum / 427 cast iron headers99
« on: November 02, 2015, 09:53:57 AM »
I'm building a 427 with iron high riser heads and have a nice set of original cast iron headers. Does anyone know of any dyno comparisons of a 427 with and without iron headers?  In other words how much hp loss would they possibly give.

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