364 High Oil Pressure

[CYCLONE 1952]

Since I Have Have Rebuilt A 364 I Have Had A Problem With High Oil Pressure (90lb)@3000 Rpm This Causes The Lifters To Pump Up To The Point That The Valves Ride And The Engine Runs Erratic And Stalls .the Master Rebuild Kit Was Supplied By Kanter All The Machine Work Was Done By A Very Recognised And Respected Local Firm .i Have Removed The Oil Pump Several Times To Check Clearances And The Relif Valve . I Have Tested This By Means Of Removing The Ball And Spring I Pulled A Piece If Air Hose Through From The Ball Side And Up Out The Pump Body On The Pressure Side Refitted The Ball And Spring And Cap I Put A Pressure Guage In Line And Introduced Air At 40 Psi The Valve Started To Flutter Increased The Pressure To 50 Psi And The Valve Fully Opened,now The Thing That Conserns Me Is The Genuine Buick Chasis Manual States That The Relif Valve Is Supposed To Mantain The Oil Pressure To A Constant 40psi
Hope Some One Has Got Some Ideas Regards Tony In Oz

[Aaron65]

Is there any way you could try a different oil pump just to rule it out? Maybe when it is bolted to the engine, it distorts in a way to hang something up...not too likely, but I'm not sure what else it could be, other than a restriction in the oiling system somewhere...