Re: sandblasting exhaust manifolds
Forest,<br /> Not knowing age of manifolds but seing you are from N.C. I am assuming you operate the boat in <br />salt water. The normal rule of thumb I use is <br />5 years. This could move either direction depending on how you take care of it via flushing and winter layup. My first education on this came in the end of the eighty's when I pulled a set off, wire brushed them and repainted. Damn they looked good! Three months later I hrydrolocked the motor because one maniflod leaked water into the combusion chamber. A nuked connecting rod and<br />damaged piston later I was educated. This wasn't the last time I have seen this. Three times since I have had buddies that elected to go the inexpensive route and replace just the risers? To this day I don't know why? One hydrolocked motor, <br />one had the engine crankcase full of water (I guess his rings were worn) and the other burned the valves out of the head.I am a firm believer that if the outside looks really rough then the insides are in worst shape do to direct eposure.<br />Go for the long hall and replace them.<br />Charlie
