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I have fiberglass mufflers with raw water going through the bottom of the manifolds and out the riser into the mufflers.

Hello guys. Im new to the site and would love to hear your input. I own a 2000 340 and ive had nothing but bad luck. Recently my engine failed after a piston made contact with an exhaust valve. My manifolds and risers are 2 years old and the heads were recently rebuilt. I bought a brand new 454...