ok, right head only steamed. But you do have an interesting observation. The dyno sheet shows 14.6 a/f at 3500. Sheet doesn't go below that and we only ran it up to 2500 during testing.
Swapping heads around would mean adding new air bleeds which is doable.
Thermostat is a Stant 180 with a block off plate from Dennis Q. Verified opening temp and distance to be within tolerances and correct.
trivia (if you believe engine dyno numbers) 632hp/594tq at 6300
Oh... and the engine builder is out of business. :-/
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