Find the combustion chamber for head
I got some PRC head whit casting #862 and the machine shop told me it was 67CC. After searching on my casting number, they all said its a 62cc from the begening.
I dit a test and I was able to put 62ml of water in 1 chamber. I put a plexiglass on top so the water was only in the chamber and did not do a dome effect.
So who I trust ? My test , the machine shop or the casting number ?

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