shilo
New Member
The stock Merc cast iron exhaust manifolds - any ballpark figure on how long they last in freshwater? I have a 1990 Sea Ray 220 Cuddy with the 260hp merc and just under 400hrs. It appears that the exhaust manifolds and risers are the original and I'm wondering if I should replace them before anything bad happens. Is there any sort of time frame or life expectancy for these?