Well last weekend it pushed a soft/core plug out of one and this weekend the center motor decided to leak water into two cylinders while sitting. No damage but damn this is getting expensive buying a new set of exhaust manifolds every weekend.
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Did they freeze last winter? you might want to get the rest pressure checked to be on the safe side....

Sorry to hear about the troubles it looked great when you went by on Saturday and it was good to see the boat out again.

Typical place that Gil manifolds crack

The past two winters they were off of the motors, empty, and were laying on a shelf in my garage. I honestly think this one was cracked and just trickling water before my rebuild project. I had 22 months to pressure check them but of course I never did I just assumed they were ok.