This engine started out as a HP500 bulldog, and bulldog comes with a Melling high output unit,the bulldog came with a 12 qt Merc. cast aluminum oil pan

So stock 500hp cooler now on a 572ci making ?????

If you suspect oil foaming, trying running the pan 1 quart low on oil and see if that helps.

Am i correct in assuming you havent checked oil temp at wot ? Or you did?

HM,
The 572 Dyno'd at 680Hp, attached is the Dyno run sheet. And right now the oil is about 1/2 qt low, (oil level is 1/2 way between low and full on the dip stick). And I can't check the oil temp at WOT with the IR gauge, my oilt temp gauge never moves.....

My guess would be the stock cooler isnt enough to support nearly 700hp. But without the Oil temps, just a guess

Check the resistance at the meter, I had a similar problem and I found a break in the wire inside the insulation. As far as Kendall oil, I hate to go here, but I used to run Kendall Racing in my Trans-Am and it had horrible viscosity stability. I run Amsoil Dominator 15w-50 in my 524 pushing 700hp. My cooler is actually a little small and after a hard run my oil gets up to 270 but pressure stays constant while running. The pressure will drop at idle to 20psi for less than a minute when I drop to an idle, as the cooler catches up the pressure comes right back.

When I shot the oil cooler with the IR gun yeterday after 3500 rpm cruise, it read only 85 deg. That is what is making me think the oil therostat is not opening at all.... The oil cooler is not even hot to the touch, but the oil filter is and the thremostat housing are both reading 180-185 deg. after the 3500 rpm cruise....

TIL,
I have verified the gauge and the wiring is good, according to Livorsi, if I take the lead off the sendor and ground it on the engine somewhere, the gauge neddle swings full hot, so Livorsi says the gauge and wiring are good, and I talked with Liviorsi and they gave the Ohms readings I took out the sender and boiled it and got the Ohm readings I was suppose to.... i think the sender is good....

Is the filter pad bypass plugged or are you running a 30 lb. bypass valve? I ask only because I've seen this problem where the bypass valve was left out of one engine. Starboard engine would hit 210 on the guage, oil cooler t-stat would open, and oil temp would drop to 180. Port motor oil temp wouldn't budge. Filter pad bypass was never plugged and no bypass valve installed. Put plug in bypass hole and port motor built oil temp just like starboard. Oil temp sending units were located on remote filter housing.

That is 2 Q's I don't know, I'll try to check it out

Bingo .. that's it change t-stat its like 25-30$ just went thru this. t-stat closed, no flow to cooler..go to BAM web site put in HP500..u will c a diagram of the filter/housing with the t-stat set up. it has a spring that holds it in place, but also keeps a non functioning t-stat closed. its essentially a diverter valve.