spun bearings

[hpontap]

Exactly, the HV pump is putting out a lot of oil and when you enter the turns, what little is left in the pan either runs to the front or climbs up the right side away from the pickup.
If you blueprint a stock GM pump or an M55A , if the bottem end is right, you will have plenty of oil pressure without sucking the stock pan dry.

[1Blacksheep]

Large Oil pressure fluxuation has alot to do with sloppy tolerance's and heavier wt oils. Its a ballance also that most professionals have found. HV means nothing if it doesn't have its match tolerance and capacity and usually ends up keeping the bypass well lubed.

[dirty white boy]

if 20/50 weight oil was cool,..with hv pump,an high rpms an 80 p.s.i. coulda just washed the barrings outta it....

[oldgold]

motor was run 1 hr before we arrived at track never went above 5500 170 coolant, 55-65 on track for 8 laps and it startrd to drop at 20 in the turns light came on and brought it in.

[anthonycacace]

motor was run 1 hr before we arrived at track never went above 5500 170 coolant, 55-65 on track for 8 laps and it started to drop at 20 in the turns light came on and brought it in.

Had something similar happen to an enduro motor once and it turned out to be a sticking piston pin. Although, I didn't have new rods or pistons, it was a new crank and bearings. I thought if you have to tare it apart anyway, may be worth a check.

[Hendrens Racing Engines]

motor was run 1 hr before we arrived at track never went above 5500 170 coolant, 55-65 on track for 8 laps and it startrd to drop at 20 in the turns light came on and brought it in.

Wet mag crank, grind if not cracked to low side of tolerance, check big end on rods, resize if necessary, grind out oil return holes in the back of block as large as you can get them. usually 70% larger than stock. ck oil return holes on heads for head gasket or block obstruction where they meet the block, grind out if necessary. install BRASS stand pipes in the center holes of the block one inch long, this will allow any crank case pressure a place to escape without fighting oil thats returning down the ground out end ones. assemble with .0025 rod and .003 main clearances,use 10/30 oil with your H.V. pump. go race it. Bill