SM Head Modifications on a budget

Earlie A said
The chicken casserole is just going in the oven, so I had a few minutes to kill. Here you go @Yellow Duster. Tested the stock almost square corner 1.6" Edelbrock exhaust valve vs the Edelbrock exhaust valve with a 1/16" radius on the face. As often is the case, surprising results. I really thought the radius would help at low lifts and have no effect at high lift. I have no thoughts on an explanation for this.

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You are playing in the grey area.

You are talking about a change of less than 2% at the most.

Flow the thing backwards and see what you find.

All this testing is dandy but not being able to hear the test makes it all the harder to see if the changes are actually going to produce the expected results.