You "might" see some cavitation errosion on the head surface there if there's a trapped air pocket but I can't see how this is going to improve cooling at all given the 2 large ports at the sides (back of the block is a dead end for the coolant anyway it's not going anywhere afer #6)
#6...
How does it get "trapped"?
You have a big arse Banjo back there into the heater lines/bypass hardpipe.
If someone can show me that this actually does something I'd happily pull the head off my fresh build and do it but I've never seen anything other than anecdotal evidence.
As I said...
The Tensioner bolt is large diameter and the cylinder wall it bolts to is quite thin.
Even at 36 ft/lbs I've measured a half a thou deformation, way back I trashed one of my blocks by over tightening it, there's a quarter sized spot in the bore that the rings have never touched and the motor...
Mine runs +5>8c at 70 mph without the undertray (going by MoTeC logs and NOT the stock gauge)
My cooling system is about as good as you're going to get on a Mk3 so any less I'd expect to see a bigger difference in temps.
The stock gauge has a dead zone and isn't linear it goes...
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