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New Valves, break in???

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Id install them and pour gasoline in the manifolds and see if they leak.

Cause you're getting brand new valves and putting them into used worn seats. There is a chance those surfaces dont match. The right way to do it is get them professionally machined to match with three angle cuts.

If they're steel, you could get away with lapping. Dont lap Ti valves.

Theres no break in. They're not piston rings. If they dont seal, they won't seal

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Ya but cut to match? That valve has to fully seat. Thats why I like lapping. You got steel valves?

Its not a huge deal. Just a .001" gap will be a leak. Just pour gas into the manifolds with valves and springs in. If it doesn't leak you're fine. If it does, lap

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If you gave one intake and one exhaust valve to whomever cut your seats( assuming it wasnt you at home), you are all set.  And I also assume that you or whomever finished the build lubed up cams and valve stems with the product of your choice. Go ride.

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