1965 ford 352 engine blows oil out of breather. what causes this. pcv valve in right side of engine. should I have another breather installed or additional pcv

Oil is coming from pcv or breather pipe. You probably have excessive piston ring wear causing blowby and forcing combustion gasses up the engine and into the breather and pcv system. Oil will come with the gasses if not filtered out. Check the pcv valve for proper operation and check any breather cap for baffles to keep the oil in the valve covers. Also consider getting an engine rebuild, if you want to keep the car.

The PCV allows one way flow and vents pressure (gases) from the engine and sends them to the intake side of the air breather for re-introduction into the air intake system of the engine.
A non-working or stopped up PCV can cause a build up of pressure, which must vent somewhere. The oil dip stick is often the choice, especially if there is not a tight seal at the top of the tube.
White smoke or steam/ vapor usually means water is entering the internal workings of the engine. Head gasket leaks, cracked heads, and cracked blocks are the common source of such entry. Also water leaking into a cylinder will cause hard or poor starting as the piston is working against the volume displacement of the water. Upon cranking any water so leaking will be exited through the exhaust system and leave the vehicle as a white vapor out of the tailpipe.
Considering that most diesel engines have some "blow by", some water may be expelled out the PCV circuit.

it could be a blocked pcv valve on the tappit cover . that controls engine blow by , caused by engine wear. as the engine gets older the rings wear and combustion gasses escape past the compression rings and enter the sump , if there wasn't a pcv valve it would pressure the engine and blow all of the oil seals out, the pcv valve is there to control these gasses and return any excess to the inlet manifold . it is possible that this valve is faulty. it is also possible that you have over filled the engine oil and this may be causing a issue. or the worst case scenario is that the engine is worn and posibally needs new rings. depending on how many klms are on the odometer I would be looking at all options before going down that path, as it is a expensive operation . hope this is of some help to you

About your question about the pcv YES if the pcv is not working/plugged it will build up presure in the crankcase and it will find a way to relieve itself out the dipstick oil filler spout or any other way it needs to have ventalation as the older cars pre 68 they just had a breather tube on back or left side of engine so in short yes this problem will cause the oil to be sprayed top of engine or any other easy exit it can find so replace pcv and all will be good hopr this helps you

The PCV valve does not control the oil situation, it just keeps the pans and valve covers from blowing off during a backfire. Excessive Oil in the breather is a result of excessive crankcase pressures, usually due to a worn engine, specifically rings.
SOME oil is normal, especially if you are loaded heavily and hard on the throttle.
There is a tester that measures crankcase pressures, but usually some other manifestation shows, like excessive oil consumption.

the PCV system draws crankcase fumes into the intake at idle and lower throttle situations. air going into the crankcase is filtered by the small PCV filter, where the oil shows up....

At highter throttle and lower intake manifold pressures, the system reverses, the PCV valve closes, and the fumes exit the crankcase VIA the breather filter. All of this is normal.

It costs tons less to periodically clean or replace the PCV filter.

blocked engine breather pipe from sump to inlet manifold but i would need to know model to tell you location of teh the offending pipe and if its an american vehicle then i wouldnt know

not a good idea, engines rely on negative pressure(vacuum) for seals on crank and camshaft seals
also for emission standards, sorry

its not pressure its blow by and the only way to correct it is to get new pistion rings and valve guide seals but if it was me i would just rebuild the engine.

Your engine breather system is blocked....this means that the only way that the compression caused on ignition that is getting past the piston rings and into the block can escape is via the dipstick tube.
Check breather for kinks and some have filters ensure that these are not blocked

the motoor is having trouble breathing pcv may be clogged check all breathers clean as needed or its over filled