Quote:
Originally Posted by 69 customcamper
I tried 5/30 and oil pressure dropped to 25 when it got warm.
Standard melling brand Hydraulic lifters. Started with a chinese brand which I swapped already as at first a few would not pump up.
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Nothing wrong with 25 psi hot idle. You only need 7-10 per 1000 rpm.
When you changed lifters did you try to break the cam/lifters in again.
Sounds a lot like a cam getting wiped.
Big blocks are notorious for wiped cams.