I just wonder about how much of the 30-40 year old mods (when everyone ran really thick 40/50 wt "racing oil" like I did in the 70's and 80's) really apply when dealing with modern oils? I fully understand priority oiling to the mains but (for example) if you're running pressure fed solid lifters with axle oiling why wouldn't you want oil to both sides of the galley? The #1 main (and Driver's side of the motor) only gets full time oiling if you use a fully grooved main bearing, most of us run 1/2 to 3/4's.

I've become a fan over the years of thinner oil, tighter clearances (on a well machined crank of course) and a cooler to try to maintain moderate oil temperatures. I concentrate mainly on the supply side, big pump large capacity, ported and polished #5 cap and pump, etc. Of course I'm not turning >8500 RPM, more like 7200 max. Additionally, Internal parts are much lighter and lower friction than they were when most of these "bibles" were written as well.

I'm not criticizing any "tried and True" methods mentioned here, I'm just asking the question as to whether the approach can be modified a bit for modern rotating parts and lighter rotating/reciprocating masses flowing in much thinner, yet far more stable and "slick" oils. The Nascar guys have proven that thin oils (delivered very strategically) at lower pressures and stable temperatures can save power and provide longevity in race conditions.