If you are having seats installed and cut into it, I'd get the valves and head to a machine shop and let them cut the seats. They can do a 3 to 5 angle cut on the valves too.
Basically I'm saying, just get the valves and head to the shop and let the machinist's do his thing and decide on the valve seat angle, or match the seats to the valves you get.
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"How I learned to stop worrying and love the OHC Pontiac L6"
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