Friend of mine has a rebuilt 340, stock bottom end, x-heads, upgraded cam and what not. He has about 10,000street/some strip miles on it and it seems to have, what i would consider, low oil pressure.

he is running 15w-40 with a little lucas stabilizer ( about 1/4 of a bottle) and

cold cruise is 65psi
cold idle is around 50

hot idle is 15
hot cruise is about 40 (~3,000rpm) and might get up to 50 if he runs it through the gears. is it just me, or is that kinda low for a 'low mile' mill, he is concerned?

Crank was turned .010, had new rod bearings and half-grooved mains with a melling hi-volume pump. Nothing fancy, and the clearances and such were not checked at the time.

Any suggestions? Maybe a quart of 20w-50 in the 15w-40 help keep it up?