Checking your engine performance on a chassis dyno?

[DAVID GAGNARD]

Oil presure before the dyno run had always been 80-90psi at idle cold and 23psi when warm, driving was around 70psi

I think that you cold idle oil pressure is way to high at 80/90 ps...you'll see most engines of similar components is the 35 to 45 cold psi range........

hot oil pressure at 23 psi is o-k,at high rpms, 70 psi is what i would consider the max, anything from 50 to 60 would just fine......

Also, way too much differential between the cold/hot readings, as someone already said, you may have already had bearing problems.......

to compare, my 331 race engine running 15/50 Mobil 1, cold idle,just a tad under 40 psi, hot idle, just a tad over 30 psi, at anything above 2000 rpms, from 50 to 60 psi max........7000 rpm chip in the MSD box......

David