As long as it comes up off the peg when you rev. it above idle ,it's good to go
.
When absolutely new , maybe 15 # @ idle then increase to 30 ~ 35 PSI under load
but , these are old tech , high volume , low pressure engines so no worries .
Nervous Nellies always insist you have to change the gauge but you don't ~
_millions_ of old Chevies ran 235's for many years with the low pressure 216
gauge and never had any problems .
If you've overhauled your engine and are wondering why the oil pressure seems
so low , it's prolly leaking out by the cam bearings.
Simple pass/fail test : warm up the engine then let it idle and remove the oil
filler cap and peer in at the rockers clicking away ~ each one has a little oil
relief hole drilled in the exact centerline of the top , if you see oil
dribbling out , FANSATIC ! you have a great oiling system .
If , OTOH , like most 235/261 engines , you see nothing coming out , rev. the
engine a bit , not a whole lot , maybe to 1,500 RPM's & wait a few moments ~
oil should begin weeping out the tiny hole and flying off the rocker as it
clicks .
If so , congradulations ! your engine is fine .
If not , don't panic , try a HOT oil & filter change using synthetic 5W
whatever oils , this will clean up the sludge in 90 % of the older , dirty
engines after you drive it a few hundred miles .
If you see crispy burned looking dry crap all over your rockers , the top end
oil passage is plugged , you'll need to make up a simple by-pass line that runs
from the oil gauge fitting , 'round the back of the blockand up to the 1/4" NPT
fitting in the dead center right side of the cylinder head , then a HOT
synthetic oil change.....
I hope this helped , it's not rocket science here , just tinker it back to
health and it'll be fine .
-Nate
Gerry wrote:
>
> I would like to know what is the normal oil pressure is for a 1956 235 ci
> full pressure engine? And will I have to change my oil pressure gauge from
> the 0-30 to the 0-60 ?
>
> Thanks Gerry
>
------------------------------------
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