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2003.5 340 SDA, 8.1 Mercs 990 hrs...after 20 seasons my port seal is slightly leaking. My question is do I replace only the Lip Seal (of course on both engines) or the entire system to an updated part? Your input is much appreciated plan to do the work while the boat is hauled for the winter. I...

I own a 2003 340 Sundancer with 280 hours, engines run great no problems. I understand Merc switched from aluminum to cast iron riser and or manifold in '04 or '05, I have never removed for inspection nor is their any sign of leakage on the outside, any suggestions, should I leave the aluminum...