New exhaust system? As things heat up they'll smoke a bit.
for a flat tappet cam, you'll want to get it up and running while varying the engine speed, 1300-2000 rpm is the range I think? anywhosit, don't let the engine just idle while your breaking in the cam, call your engine builder and see what they reccomend, or call your camshaft supplier and see thier recomendations, if its down a half day thats better than a day or two pulling a worn cam
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