[NeighborsComplaint]

How would you still have coolant in the exhaust manifolds? You typically remove the manifolds if the heads were sent to the machine shop for valve and machine work. You will typically get coolant spillage into the cylinders which you should remove with towels or a wet vac. The residual coolant that remains in the ring lands will cause a bit of initial smoke on startup but it clears up immediately.

Check your oil for antifreeze contamination. The obvious culprits are intake or head gasket leaks.

[242177P]

You're right to be wary, but I'd say it'll take considerably more than 3 minutes to cook all the condensation out of an exhaust system. And that's with a daily driver. Wouldn't a cold muffler act as a moisture trap until it's good and hot? If some folks in the neighborhood are going to wrinkle their noses, you can always run it after dark. Internet says sundown in NC is 5:26.

Life's too short to worry about what everyone else might be thinking. Heard a neighbor doing a compression test in the evening once, went over and offered a hand 'cause I though he had a no-start. He was concerned about the neighbors too. Told him the "noise" wasn't an issue and anyone that would call the cops need their head examined.

Originally Posted by NeighborsComplaint

How would you still have coolant in the exhaust manifolds?

Head. Pipes. It's right there in the original post.