Ok so… Where the 2 hoses off of the thermostats and tee off to the tell tail and a nipple the seems to go to the above water water and leg exhaust. Remove that hose to exhaust an let it free flow in to the water and engine cools a lot better. There is a fair amount of pressure that is coming out...
We are having over heat at idle and on plane. Confirmed by mounted temperature sensor and thermal heat gun. It is on both sides of block with reasonable similar temps everywhere but cooling as you get in to centre of block as expected. New poppet valve kit, water pump rebuild, impeller and all...
