You may already know this... IMHFO It really depends on your assembled crank & rod bearing clearances, every engine is different & you really shouldn't base your specific combo on what someone else's car has or does, unless they are nearly identical combos, weight, HP/TQ, fuels, gears, tuning, ignition, compression etc.... To me it's all about the more clearances the more pressure you could/should run, probably more viscosity too... Also you should run an oil that is the best for lubrication, wear & temperatures in the range you need them for your specific type build... I personally like my engine oil temps to be about the same as engine operating temps 180*-190*, It served me well for many years... In my race cars, I used exclusively Torco Racing Synthetic Oils {it ain't cheap & I never had a failure due to the oil breaking down} for many years 30-40w N/A engines & up-to 70w for Blown/boosted or N20 combos, depending on temps & specific combos or fuels used etc., I ALWAYS RAN an O-berg screen Filter & a dual remote oil adapter with K&N 3000 filters with a #10 line out of the oil pump & back into the pump, it drops the oil pressure maybe 5psi max thou {I like Royal Purple too, cheaper more readily available than Torco Racing oils & I've had really good luck in my street/strip cars, with no failures, because of oil yet}... I used what works best for me, not what someone else used... I would changed oil viscosity to achieve the proper engine temps & oil temps, but also checked bearings regularly to make sure they aren't discoloring, burning or scuffing because of starvation &/or heat because of lack of viscosity or heat... IMHFO a lightweight oil maybe good for a record pass here & there, but the gains aren't hardly worth the results or wear, but I wouldn't recommend it for full time usage either, unless you have a multi-stage or dry sump oil system or an external racing type oil pump & vacuum pump... IMHFO your oil temps will sky rocket, if it's too thin & wipe the bearing pretty quickly.... I also wouldn't suggest that you run less volume of oil {like 6qts} in a 7qt pan system, your defeating the purpose of a larger capacity oil pan & high volume pump, for more oil to keep the sump/pick up submerged & the extra oils cooling abilities... IMHFO you could starve the pump/pickup on hard launches or hard deceleration/braking with a high volume pump & 100psi will drain the pan pretty damn quickly... I wouldn't really worry about the cold oil hi 100 PSI's... I would suggest you run the engine long enough, to get the proper heat into the oil & engine before any passes down the track too, far too often people don't let the engine & oils get to proper running temps before making a pass & they have problems with wear... 67satty good luck what ever you choose to do...
