Moving target
I ordered my stock 0-360 from Vans’s last Dec 2. I was told to expect delivery near February 22, roughly. I changed my order to a Thunderbolt engine in early January. I worked directly with the good folks at Lycoming to facilitate the change, copying the good folks at Vans’s, of course.
Bottom line is that I expect my engine to ship from Lycoming in the next few days, per them. I was told by Lycoming that lead times have reduced significantly due to Covid inspired order cancellations in the last several months.
I would suggest that for the latest accurate lead times, you should contact Lycoming directly. They seem eager to please and happy to have our business.
Good luck, Jim