You will need 8 of each. The 1815 are the exhaust valves and the 1816 are the intake valves. The intake valves are 3mm bigger than the exhaust valves. I normally deal with Race engineering in FL. They have pretty good prices and stock pretty much everything their # is 561-533-5500. Call them up and tell them you need stock replacement SS valves for your motor. They offer two brands. The cheaper ones are still good, but Ferrea has the name.
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