Which bolts reach water jacket on 340

Thread sealant, my favorite as of late is Permatex hi tack in the can with the brush, IIRC, all the water pump bolts are wet, and the end holes that are studded on the exhaust flanges are wet. As noted, water pump washers are a necessity, put a little thread sealant around the shank of the bolt at the head and on the backside of the washer too. It can get a little messy but it acts as a redundancy in case anything makes it past the threads.