The truck gets between 40 and 60 PSI when moving. After warm up at Idle
its 22 PSI. Is it time to change the Oil pump? If so, is a standard off
the shelf sufficient or should I get a high volume pump? I mostly drive
like grand maw rarely getting above 2500 RPMs! I do need to take this
into the mountains on trips and worried about loosing an oil pump!

Skip wrote:
Sounds normal for a GM pump. Idle spec on the small block is 15-30 psi
with a 10 PSI increase per 1K rpm.
Keep the oil/filter changed and you likely will see the body rot off
long before the engine wears out. I have a van here that has about 300K
on it, engine still runs like a watch (it does burn about a quart every
1500 miles) but the body is close to God (VERY HOLEY)

--
Steve W.
Near Cooperstown, New York