Hardened valve seats?
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From: Bernville USA
Hardened valve seats?
I have a burnt exhaust valve or seat(low compression and popping from exhaust)
. Its a 72 F100 302 are the exhaust seats hardened? The guy from the machine shop said he thinks they are from 71+. But does any on know for sure? If not would heads from a 79 F150 302 work ( same size combustion camber and EGR)? 
Thanks in advance
. Its a 72 F100 302 are the exhaust seats hardened? The guy from the machine shop said he thinks they are from 71+. But does any on know for sure? If not would heads from a 79 F150 302 work ( same size combustion camber and EGR)? Thanks in advance 
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