Oil pressure or lack of it!

[rossins]

Looking for some advice. Have recently had my 6.3 smallblock rebuilt after spinning a bearing - new block used. Engine looked fine after initial start up, running smooth, good oil pressure. Ran for about 30 mins & then a few days later started up & oil pressure is not getting above 2 bar. I have checked oil pump, pressure release valve, pick up pipe & big ends all fine. No sign of copper in oil. Is there anything in the sandwich plate (oil cooler fitted) that may have an impact. Any ideas gratefully recd _ Oh & by the way it has plenty of oil in>

[pilbeam_mp62]

I had a problem like this once, and it turned out the pressure gauge was faulty - it may be worth checking that to at least eliminate it from your enquiries.. ?
Regards

Kelvin

[rossins]

Gauge would appear to be fine, as the acusump gauge is only registering pressure of 25psi & when previously running the AS registered 60psi.

[Steve_D]

If you believe the mains and big ends are still in good order I would start by replacing the oil pump. They are not too expensive.
One possibility is that you have lost the blanking plug from the end of an oil gallery.

Steve

[jacko460c]

Change the filter first. (If it is a spin on type) they can collapse inside either blocking or restricting flow.