I was thinking the same thing, a leak that large would point more towards water from the manifolds?

These are closed cooled engines, and it was anti-freeze in the cylinders. It can't be the manifolds....

Maybe there is 2 separate issues going on here? Like there was water and antifreeze in the cylinder, so head gasket and manifold issue? I have seen engines run longer than 2 minutes on a blown head gasket.

manifolds are Hardin and brand new.

I doubt they would be leaking that much straight out the box


the whole point of getting them was to avoid the leaking of cmi’s

Do you know what head gaskets were used ?

Head gasket or intake manifold gasket is the most likely cause

any update