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It looks like it has 4 valves but the spark plug location and valve geometry sure look like a 426 hemi. Here's one of my pistons to compare:
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This was the result of the second owner of my Charger trying to rebuild the hemi drunk, while sharing a case of beer with his buddies. He installed them all backwards. The motor locked up and it punched the valve head through the cylinder head and the piston. Very impressive. I carry the schrapnel in my glove box for car show use now.
Friends don't let friends rebuild engines drunk.