Well, this is weird... Wife started the engine with outdrive fully up but boat in water.. I get in boat after parking the trailer and water temp guage is pegged... New impeller and housing... Works but won't hold a prime... Marine mechanic replaces two large rubber seals inside of the drive.. Take boat out today... Wife backs away from boat ramp with outdrive fully down this time.. I get in boat and drive away slowly.. temp guage slowly rises to 200 so I shut it down... Remove input line to T-stat housing and have wife start motor... Scalded by hot water blowing out T-stat housing but fresh water is pumping up from the outdrive... re-attach hose, restart and temp goes down to normal... Drive boat at WOT and get 4550 rpm and 37 mph (1988 four winns 160 freedom, advertised top speed of 38mph). BUT.. temp is running a little high... 180-190... back down and then temp comes way down, next WOT run and temps is a 10 degrees cooler.. that's more like it!( piece of old impeller flushed through?)... I believe the T-stat is suppossed to open at 170?.... After the second WOT run (approx 5 min.) I slow to idle and run the bilge pump, dunno why.. just like to flip the switch every now and again since it's not an auto pump... About 5 gallons of water comes out.. DOH!.. Open engine cowl w/ engine running and sure enough, water spewing out a crack in the block!... Fortunately the crack is low, maybe 2-3" above the oil pan on the port side, half way back. The crack is maybe 2" long... Dang, no JB weld in the new tool kit I put on board... Well, I JB Welded the hell out of it tonight.. will pressure check tomorrow.. Thoughts? Prayers?