Hello, which size does have these plugs? Its for an engine block No.GM 3837004 And do the plugs have the same size as for a block No. 3835911? http://www.kripahle-online.de/unterricht/wp-content/uploads/2016/03/235ci-links-Nummer004-T3.jpg and http://www.kripahle-online.de/unterricht/wp-content/uploads/2016/03/IMG_7099.jpg Where do I get them? Ask Wolfgang
Rock Auto only shows two sizes of freeze plugs (called expansion plugs in their catalog) for a 235---any year. 2.0 inch (50.67mm) and 1.625 inch (41.54mm). Cost about 50 cents.
The large freeze plug goes on the rear of the engine. Napa should have them as well as places like Chevs of the 40s, The Truck and Car Shop of Orange, etc..........etc.............
I just did both of my side ones.... 1 5/8 are what I used...only one was leaking, but decided to do both. Should be able to find them everywhere and cheap. So far, they are not leaking. rod
a couple of things that I forgot to mention. Use the brass ones and put a coat of Prematex on the outer edge of the plugs, before installing.