Jpegg, Just read your post quickly at my lunchtime.Just make sure you understand the difference between actual "oil pressure": (40lbs,60lbs.,80lbs., whatever) that is governed by the oil pump sending oil ,by pressure,thru' your engine tolerances.... like camshaft to camshaft bearings,crankshaft to main bearings etc,etc. All these pressures are governed by the oil pump and these many tolerances. As opposed to crankcase/oil pan pressure which is your internal moving parts, like pistons etc.,creating a pulling/pushing of AIR in the motor. This is where folks are heading with the answer to your problem. There has to be an outlet for this air moving in and out of the oil pan & engine via PCV valves etc. A very oversimplification of the engine but just wanted to make sure you are on the same page as the doctors here. Good luck,you'll get it!

 

Did you install the dipstick with an o-ring on the bottom?

Do you have a breather on the valve cover?

If the answer to both of those above is yes, then you have excessive blow-by in your shortblock and need a rebuild or pulled apart to inspect why.

 

I have 140lbs of compression on avaerage, I do have pvc valve hooked and does not smoke. But let's assume there is no excessive crankcase pressure, if the dipstick tube fitting was to small of size for the hole at pan wouldn't oil still blow out hole?

 

Did you install the o-ring on the dipstick tube?

 

 

wow that sucks!

BTW - oil pressure post pump would not have anything to do with your issue of pre-pump.

 

No original Ford engine oil dipstick tube uses an o-ring. Only A/T dipstick tubes use an o-ring, because there's a provision for it.

 

I am not really sure how that's relevant to this thread?

 

I responded to what you said in post #22.

 

 

Yes, but there's no provision on a original engine oil dipstick tube to install an o-ring.

Since the pan is a replacement, if it came w/a tube, it may not match the original.

C8SZ-6754-A .. 429/460 Engine Oil Dipstick Tube - 6 19/32" long / Obsolete

1968/73 Ford/Merc Passenger Car 429; 1968/78 Lincoln/Continental Mark III/IV/V 460; 1972/76 Thunderbird 460; 1973/78 Ford/Merc Passenger Car 460; 1973/79 F100/350 460.