I still go w/ the old school train of thought b/c it's served me well. I use 20w50 in my hemi b/c the clearances are on the loose side.
Clearances weren't mentioned in the OP and that'd critical in the decision making.
Yeah, didn’t mention clearances mainly because I figured most race engine builders shoot for close to the relatively same clearances .002-.004 but I may be off base, I kinda assumed that anyway
, it’s a really good point, I’m not smart enough to go down the rabbit hole of bearing clearances and viscosity relationships…lol
