Yep, and I think it was 1963 when mopar went to those bearings and the 1/2" pick-up. Guys were spinning bearings left and right on their big block mopars, chevies and ford's. Ford and chevy went to priority main oiling and 4 bolt mains. Mopar just simply quit on the wedges in early 1964 and thru all their effort at the hemis.
I think Hemi's have always been full groove bearings.
Race and street used the same bearings. Street hemis idled at 15lbs.
What did Chrysler determine was normal pressure at hot idle for a big block back in the day?
I rarely run it at full throttle for more than a few seconds and do have a 6 quart "hemi" pan with windage tray on this motor, so thinking I am good.
Factory street wedge 45psi, except for 6bbls that used a 65lb spring. Other than 63 and 64 maxwedge that used wide groove mains and 665p rod bearings that had .001" more clearance in them. There were bulletins put out that began before the milodon era for converting to outside pickup and evoluted from there. I remember reading them and having them. Unfortunately I didn't keep any of that thinking I'd never get back in this again after I quit it in 1974. oiling was a big deal. It was the main component to keeping the engine alive.
I never heard the "8psi" back in the day. But, one must keep in mind the 8psi engines never hot idled at a stop light for half an hour. All that is taken out of context when applied to a street engine.
back in the day it was said 10 psi, later they came up with 8 psi was plenty.
I don't recall those numbers being used as "ok" in the day I was back in. I still say it's all taken out of context by today's mopar culture.
20 psi minimum at 500 RPM, 45-65 psi at 1000 RPM for all V8s except Hemi, which called for a minimum of 15psi @ 500rpm, that's straight out of the '68 FSM.
You need viscosity to fill the "gap". Unfortunately it's all a double edged sword;...damned if you do , damned if you don't. I still suggest trying some 30wt rotella; cheap test. I get concerned about oil film strength. I know there's some modern oils with high strengths but seriously doubt their intent was to fill those big gaps. Race clearances and street clearances are two different things.
The $64,000 question is: WHO ARE "THEY" AND WHAT IS THEIR PROOF OF THEIR PREMISE?.......or is it a just another unsubstantiated comment or relieving in hearsay? Let's see some pix or calculations to support your prenise.......
tell me where the oil pressure is to be at. mine was reading from engine builders in tech magazines like Joe Sherman, David Vizard reading speed talk on and on over the years. so you can tell me what it is supposed to be. the 15 engines I built over the years for myself never blew up and I never was overly concerned or stressed out about the oil pressure.
