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I'm not aware performers/rpms come from factory with o-ring grooves.
If they do... cool
If the don't, then someone used the incorrect gasket and that is what you are seeing... the impression.
I can't think of a reason why someone would pay to have performer/rpms o-ringed is why I say this.

By the way, are those heads supposed to be fresh? I only ask because that appears to be a badly finished machine surface... but that could be just the picture too.
 

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Discussion Starter · #3 ·
noo they arent brand new....and i think the impression is for a wire incased gasket not loc wire....loc wire was the first thing that came to my head...so imm assuming the regular ford gasket i have isnt going to workk
 

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someone could have used copper head gaskets. i've seen it on a few motors i tore apart. as long as there isnt an indention on the cylinder head that you can feel you should be ok with the gaskets you have.

just my .02.
 
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