4.3 W OMC drive. Boat is a recent purchase. After checking or changing all fluids I used a large barrel to test fire it. Started right up. After few minutes noted a small water leak from bottom of the starboard exhaust manifold. I can only assume water may have been left in it and it froze and cracked it. Can water get into cylinder via the manifold while running? Had wanted to put on water and check everything out. Thanks for any help Also TKSfor great site.