The Stovebolt Site Forums The Shop Area Engine Shop GMC 302 oil lines

Just joined , but I have been browseing along for a few months. I have a 302 GMC I just put in place of a tired old 228 in a 1950 GMC pickup. My question is the 228 had a "t" fitting on the front of the block, one went to the front of the head (valvetrain feed) , the other to the pressure gauge. I saw in a "stovebolt" post on tech tips ,a note that said , this engine needed an oil filter and if the supply line on the drivers side is blocked off there will be no oil pressure to the engine.Currently the "T" goes one branch up to the valvetrain and one to the pressure gauge.There is a small plug in the drivers side of the block down low just behind the gas pedal/throtle linkage mount on the block. I did prime it before dropping in the Dizzy and had pressure up into the valvetrain. I have not started or ran it yet, still fitting the intake/carb , headers on. Any help our a steer in the right direction would be great. Thanks !

All of the gmc engines had a canister filter from the factory. The small plug at the back of the engine is normally used for the guage. Where the guage is now, that port would normally go to the filter. If you go to www.oldgmctrucks.com there will be an artical with pictures on the proper oil filter routing.

Good luck.

There were several routings over the years. At some point in time the gauge output was moved from front to back. The 228 and the 302 were probably routed differently.

Check the site GMCJoe linked to.

mine didnt

is your 302 a civilian or military
as for the gauge location it does'nt matter since both places are in the main oil galley right after the oil pump. i have one that comes off the front and one that comes off the back.

Thanks for the quick response, and the tip on the gmctrucks link.There were just short pieces of line comeing out of the fitting for the lines as they had been cut off for whatever reason.My main concern was the statement made in the article I found here " A Stovebolt Tech Tip - Engine Swap" where someone was swapping a GMC 302 in place of a Chevy 235 in their Chevy truck.It was in the "Oil and Water lines" paragraph and stated "if you block off the oil supply line on the drivers side of the block you will not get any oil pressure to the engine" - I may be miss reading this and he is refering to the "T" and the drivers side of it.........at any rate thanks for the info , I printed out the picture I found on the other site showing the filter route.
I do not know if it is military or not - sorry.I also was not going to put a filter setup on it. I may change my mind now,but trying to find one and the cost had put it low on the list as the 228 didn't have one,and lucky if the truck will get over a couple hundred miles a year.
I will shoot some pics and post them - thanks again.

There is also info on differences between civilian and military engines on the GMC site. I think it is in the Hall of Fame section of the discussion forums.

This is not to run you off from here. GMCs are welcome here too.

If you should to decide to install an orginal filter, I have both the small one for a pickup and a large one for a 302 in the big trucks. Either one can be had for shipping charges only as I have converted to the full pressure spin on filter system and have no need for them.
Joe

Thanks for the offer and help Joe , I haven't got back to the shop yet to check things out better this week,hopefully Friday.
Have a happy 4th.

if your not hung up on keeping it oem, then I would go with the spin on filter and drill and tap your block for a full flow filter. its not difficult to do, their are quite a few article's on line on how its done