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Exhaust smoke: rings, head gasket(s), or valve seals?
#2
Personally doesnt sound like rings to me, bad rings typically smoke on startup and get less as the car warms up. Do a leakdown test, compression test rarely does a good enough job.

If youve got an sort of milkshake, indicates oil and coolant are mixing. But from what it sounds like that white/yellow build up is just condensation during the winter by not driving the car long enough when you drive it. That stuff is common and goes away if you run your car long enough for the engine to fully heat up.

Can you smell the coolant? I feel like it would be fairly obvious to tell from that.

Good luck, and if your getitng rid of the lt1 let me know Tongue, but I hope you have good luck with it. Losing motors sucks (trust me I know).
2020 Ford Raptor
2009 Z06
1986.5 Porsche 928S
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