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Block Water Passages Blocked

Prolly should've been more clear (not use to tapatalk yet). Top pic is no head gasket, bottom still on. Top and bottom water ports are blocked except for a precise pinhole...

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Yeah i see what you mean now, i have the heads off of one of my ttas but i can't find the old gaskets... Maybe Ws6 or Jarred will chime in as they have had lots of practice with headgaskets.. lol
 
If I recall that's correct and they are circulating on one end to the middle two ports,with the gaskets metering flow.
I have GN block on the stand for a rebuild now so I'll check it to be sure. But I'm pretty sure it dead heads on one end.
 
So do aftermarket head gaskets have same hole or are they open, and if so is it better or worse to have the holes restricted?

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Felpro's have them open on both ends and that's all I've ever used...and I've used allot of them....sadly. So there is no left or right to them either
 
Are was talking about the same holes here?? I was of the understanding we were talking about the holes next to the valley pan not the water holes at the front/back of the block/heads.
 
And what is best way to clear the water passages of that gunk/buildup. Not sure if it was an additive or what. Anyone seen anything like it?

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So many more questions now lol. So are the front heads supposed to be block off? Or is it a problem just a few of us have? I thought maybe some radiator seal or block repair had been added... and with restricted head gaskets caused it to build up. Any verification on this.

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Timing chain stretched where valves were hitting pistons. Timing damper was all the way extended lol

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ok, so if I understand this right...your asking about the roundish ,D shaped coolant holes? and the silver graphite looking stuff covering them up?...if so that's the HG design and is suppose to be that way to meter the flow down so it can wick away heat. Am I understanding the question?
 
WS6 said:
ok, so if I understand this right...your asking about the roundish ,D shaped coolant holes? and the silver graphite looking stuff covering them up?...if so that's the HG design and is suppose to be that way to meter the flow down so it can wick away heat. Am I understanding the question?
Click to expand...
Yes, that was the original question, never seen a HG that had the d shaped holes restricted. Thought maybe defect, but guess its the original HG design, just wondered why aftermarket HG werent made that way?
But now the topic has shifted to the blockage at the front of the heads (next to timing cover). I thought it was gunked up by something, but now i see someone else with same blockage. So now wondereing if that is supposed to be like that as well?

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I have a half dozen sets of blown aftermarket HGs and all of them have that restriction,most are Felpro 9441's. It's to slow the coolant down on it's way around the head,allowing it to wick heat away.
And yes, the end ,longer slotted passage at either end of the block is cast closed from the factory. The heads are open on both ends allowing for interchangeability R to L.
 
Ok that answers everything. Thank you. Never opened our engines before, always worked on older pontiac big blocks, chevys. Car had overheating problems before timing jumped
Thanks again for info, will save alot oh headaches in the future lol

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