[1971BB427]

Had a similar issue twice. Once it was because I was young and green, and rebuilt my engine, but decided to leave the cam bearings in. Did the exact thing your's is doing.
On another build I had the engine machined at a shop and they installed new cam bearings, and got the wrong rear bearing in. It bled down pressure and my oil pressure readings were low at idle and cruise, and even lower once warmed up.
Both cases required new cam bearings to fix the problem.

[hotrodthug]

i checked the gauge with a mech. s.w.gauge,i pinned oil pickup .ihave some oil at rockers at idle hot ,when gauge reads o,so iamjust going too drive it. thanks for the info.hotrodthug

[Richiehd]

Originally Posted by hotrodthug

i checked the gauge with a mech. s.w.gauge,i pinned oil pickup .ihave some oil at rockers at idle hot ,when gauge reads o,so iamjust going too drive it. thanks for the info.hotrodthug

OK so that wont last long before you wipe out the front main or wipe a couple lobes off the cam.

[CNC BLOCKS NE]

Originally Posted by cobalt327

The diagram of the plug and measurements and its location is from HERE. By examining the diagram, you can see that the oil pressure shouldn't be lost if the plug is left out.

If the plug is driven in too far (blue circle), that's a different story.

Looks like have some more BS about loosing pressure with out the plug under the main cap.

Here is some factual or real info from real engine builders not book reader or some who does not know how SBC oiling system works LOL.

PLUG UNDER REAR CAP • Speed Talk

If you can read look this over

[cobalt327]

Originally Posted by CNC BLOCKS NE

Looks like have some more BS about loosing pressure with out the plug under the main cap.

The pressure will not be lost if the plug is omitted!!! That's why the drawing above was posted. If you carefully examine the drawing, following the arrows and paying attention to what galleys lead where, you will clearly see the oil pathway, and you can also tell how driving the plug too deep is worse than leaving it out- although leaving it out is not correct, either.