In, around dome, over holes, out. I'm sure the thermosiphon effect is working just fine in these that the coolant is moving. That's simplest way. You can make specific jackets that direct coolant directly into cylinders. Change design in cylinders of openings But get one of the thermostat heads. We aren't doing much just blowing water over it. You actually want to move heat. I wonder if we are moving the water to fast and can be more effective slowing it down maybe. But at the end of the day, there really isn't an issue. Some people over heat. But it's easily cured. So why beat your self up trying to change something that works? Sent from my SAMSUNG-SM-G891A using Tapatalk