CNG head question

fordguy91

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I have a set of cng heads off a 2011 E350 that were given to me. I am wanting to put them on my build to help with less down time. They are going to get some work done to support the cams I am installing. My question is do they have a different combustion chamber then the factory heads?
 

SID297

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I believe the only thing that is different is the valve seats. The valves may be different too, but I'm not sure.
 

fordguy91

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Thanks for the reply I am getting the spark plug thread inserts installed next week. I Just don't want to have a high compression rate then I alreay have.
 

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