420A 420a freeze plugs

[wyv344]

I'm removing the freeze plugs on my 420a, and am trying to determine if the intake side of the block are the oil plugs and the exhaust side are the coolant plugs or vice verse. The plugs seems to be different sizes on each side of the block

 

[waltah]

I'm removing the freeze plugs on my 420a, and am trying to determine if the intake side of the block are the oil plugs and the exhaust side are the coolant plugs or vice verse. The plugs seems to be different sizes on each side of the block

I'm totally ignorant on this but are there freeze plugs for the oil passages? Oil doesn't freeze. But the water jacket goes all around every cylinder and any freeze-up there will push some metal someplace. Either it'll push out a plug or it'll break the block.

I'd bet you can buy the plugs as a set just by searching for 420a freeze plugs.