Replacing oil Gallery plugs Chevrolet??

[Phil Waterman]

Hi Alex

Be sure to rod out the oil line passages, those dead ends behind the plugs can trap some nasty sludge.

I used stiff wire and slow drill to loosen anything in there, old speedo cables work well. I've seen them as clean as a whistle or heavy sludge.

Keep us posted on your progress.

Cheers Phil

[Alex van de Wetering]

Thanks Phil. Can you confirm that the wartime 216 only requires two small soft plugs.....not the threaded ones?

Yes, I will certainly have to update my resto log...

Alex

[Phil Waterman]

Hi Alex

Will have to check my restoration photos to confirm number and location of the oil gallery plugs. Mind wants to say only two drive in plugs. With screw plugs only coming in after they up the oil pressure.

But as you are replacing freeze plugs remember to get the one at the rear end block as being source of "mystery coolant leaks" coming out of the clutch housing.

Get back after I check my photos after rebuilding 6 different stovebolt engines have to refer to my photos and notes to remember what's on the original CMP and what's on later 235/261 engines.

Cheers Phil

[Phil Waterman]

Hi Alex


What is throwing me is your first picture with four of the small drive fit plugs and four of the threaded plugs.


I've confirmed that the threaded plugs are for the later engines my 261 has them while the 235 has the drive fit plugs. So we're OK there.


What I am not figuring is that I can only find two locations for the oil line plugs on the manifold side of the engine the long passage for the cam bearings that runs from front of the engine all the way to back.


Check several different vintages of CMP manuals and parts book and I can only find where those two plugs are used. So I'm at a loss as to why the kit includes 4 of each type.


Cheers Phil

[Alex van de Wetering]

Hi Phil,

Thanks for looking into this. It seems the soft plug sets the Filling Station, Chevs of the 40's and Jim Carter are selling, all have the same contents.....so all have the 4 small soft plugs and the 4 small threaded plugs. The sets are intended for 216, 235 and 261 and a wide variety of build years.
I can also only spot two of the smaller soft plugs on my 216.....would the other two be for a later block that has a casting intended for an external oil filter, maybe? I checked some pictures online and I get the feeling some 235 or 261 blocks might have two extra plugs on the side of the engine.....near the oil pan?

Alex