With amount of money we have invested in these performance motors, I'm just curious. With the exception of normal end of season wintering, how many of you jet, v-drive lake/river guys are draining what water you can out of your blocks after every weekend or race? I know after running in places like Firebird, a fresh water flush and drain is a must. I've put petcock drains on my block and try and drain it after every use no matter where I run it. Just something I've always done. Is this over kill? A friend of mine flushes his v-drive with a biodegradable antifreeze and leaves it in the block for anti rust and corrosion purposes every trip... thoughts?