Is that new gasket aftermarket? The reason I ask is because the Kohler gaskets have a "fire ring" like the old one on the left in your picture. Most aftermarket gaskets don't have that, and I don't think they work as well. It's difficult enough trying to keep head gaskets from blowing on these because the head and block are different materials, so it needs all the help it can get. Kohler's gasket is best...I would get an OEM gasket with the fire ring.
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