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was this purposely designed this way, or did Nissan over look this detail? Yesterday I was in the garage checking my battery charger and doing a couple other things when I noticed something that struck me as odd. I had one of my head gaskets from my TT engine hanging up on the wall and I took it down to get a closer inspection of it.
I noticed that the coolant paths between the block and the head are severely blocked by the design of the head gasket.
The coolant galleys on the block side are mostly triangular or oval in shape as you can see in these pictures below, the coolant has made a pollen looking residue on the gasket to show where the coolant galley is and the very small hole that the head gasket is designed with....
The cylinder head side has circular coolant galleys and you can see the size difference between the head's coolant galley and the small hole in the gasket...
I was wondering if there was a reason for this design, or was this a boo-boo in the design of the gasket? To me it seems like it restricts the coolant flow to the heads substantially. I had an idea of taking a circular leather punch to the gaskets that are the same in diameter as the round head galleys to open the path of coolant flow.
Would this gasket design be a cause of over heating in some cases? Or was this designed this way for some reason? If not, would opening up the coolant path help keep the coolant temps more stable?
I tried to do a search about this, but found nothing.
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Coolant restriction through the head gaskets... - 
