BBC oil pressure loss
Hey I wanted to check if anyone has had a similar problem before I tear into this early 454. The oil pressure drops around 50 MPH (no tach, must be around 3000 RPM.) If I slow down just a bit, it recovers and is fine once I find the speed it likes. I get around 45 psi until it drops. It seems worse under load. The engine is in my '73 4x4 GMC. It has a big truck pan, about 9 quarts total.
I thought about the oil pump filling up the valve covers and drainback not keeping up with it at speed, but that's a lot of oil in the top end! Dad says it could be the spring in the pump, I am also thinking pickup problem. I know the pickup is not welded to the pump. Anyone have anything similar happen to their rat motor?
'69 X44, stock 350 (for now), TH350, 3.70:1 gear 8.5" 10 bolt, Auburn Posi.