Engine Serial #'s & Intake Manifolds
Yes *but* GM Canada used a different series of serial #'s back then so maybe a Canadian FSM would be of help to decode the engine # , not so much the American FSM .
The intake manifolds have a casted ' ear ' that sticks up along to top edge of the front runner , when it is to be used to mount the horn on trucks , two threaded holes were machined into it ~ many were made with the ear but not drilled as they were used on Passenger cars .
Minor details no one really cares much about .
The main thing here is : jnycnuk do not be concerned that the oil pressure seems low on this engine ! it's made that way , as long as the oil gauge raises up off the peg as you are off idle , it's fine .
The other oil pressure / flow test is : when warmed up , set the engine to a fast idle and remove the oil filler cap , peer in at the rockers and if there is oil dribbling out of the weep hole in the middle of the visible rocker , you're good to go ! just tune it sharpish and HOT CHANGE that oil ASAP , use the thinnest multi - vis oils you can , like 5W-40 , synthetics are best , it'll take a couple of oil changes to clean up the inside of the engine and flush out all the old sludge from the vintage parrafin based oil that's in there now , no worries , just drive it as much as you can while you're cleaning and tinkering it back to robust health .
