I’m running VR1 and have for 3-4 years. Solid flat tappet. The weight is stupid, but it has worked for 15 years and sometimes I’m just silly like that. 20w50 sure I’m giving up some HP. 25-30 lbs at idle hot.
I have Royal Purple 10W40 break in oil. The cam and lifters have been run before, they “should” be okay. I just need to break in the rings. I plan on driving it right after starting it, to load-unload rings.
I like the idea of VR1 after break in. Just have to decide what weight. Rods are just a bit tighter than the mains. I’m leaning 10W30. It’ll be a while. The heads are “heading” in for guides and a valve job the 14th.
The big slow down will be that I’m going to paint the engine compartment, and I think that will lead to painting the entire car. Get it over with.