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**FirstOwner69** · 06-03-2014, 03:02 PM

GM sells some stop leak tablets that are required to be added when replacing the coolant in Northstar engines. As i recall, a pack of 4 is less than $7.00. Crush 2 and put them in the coolant. I did that in a brand new GMPP 350 crate engine with one of those freeze plugs leaking at their suggestion. No problems since. I THINK it may be similar to the Bars Leak powder.

06-03-2014, 03:02 PM	#3
FirstOwner69 Senior Member Join Date: May 2010 Location: Wisconsin & Arizona Posts: 4,854	Re: coolant leak GM sells some stop leak tablets that are required to be added when replacing the coolant in Northstar engines. As i recall, a pack of 4 is less than $7.00. Crush 2 and put them in the coolant. I did that in a brand new GMPP 350 crate engine with one of those freeze plugs leaking at their suggestion. No problems since. I THINK it may be similar to the Bars Leak powder.