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Extreme Veteran
Posts: 397
Location: Milano, Italy | Hi all! I received these very good head gaskets (one side metal towards the block) for my 318 Poly from Fel-pro, (courtesy of Rockauto) but the water passages in the gasket seem restricted. And this is not the first time I encounter this feature. Other gaskets by other makers have the same peculiarity. I am attaching a picture of the water passage on the block and on the head gasket. Is there a reason why they restrict that particular passage ? Or I'd better enlarge it to match the block?
Edited by lonesome mopar 2018-05-27 8:56 AM
(gasket water passages.jpg)
Attachments ---------------- gasket water passages.jpg (205KB - 109 downloads)
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Elite Veteran
Posts: 888
Location: Peoples Republic of Oregon | I would be more concerned about the restricted passages at the bottom which will be closer to the exhaust side of things....
Perhaps someone has an old oem gasket for comparison. |
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Expert
Posts: 3774
Location: NorCal | Many people call the top row of coolant holes "steam ports" i.e. not intended to flow large volumes of coolant, thus the gasket restricts the ports.
http://www.felpro.com/technical/tecblogs/head-gasket-coolant-holes.... |
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Extreme Veteran
Posts: 406
Location: Hilltown, PA |
Yep - this ^^^^^^
It may seem counter-intuitive but the holes in the headgasket are often smaller than the passages, to control coolant flow.
Remember - coolant can easily move through an engine TOO fast, preventing it from drawing the heat from the iron.
Gregg
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Expert
Posts: 3575
Location: Netherlands | That's a myth.
And, if you open up those gasket holes the water will probably take a 'shortcut' and hardly cool the rear cylinders.
Steam holes, I prefer to call those "air holes", because the coolant isn't hopefully boiling all the time.
Any trapped air has to find it's way to the radiator somehow.
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Extreme Veteran
Posts: 406
Location: Hilltown, PA |
I've been proven wrong before (and will be again) but I have to disagree.
Personal experience has shown me that you can have too much coolant flow.
Ever had an engine run hot because the thermostat was removed, yet installing one restores proper cooling?
Gregg |
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Extreme Veteran
Posts: 397
Location: Milano, Italy | thanks a lot for the hint !
And for the link to the fel-pro page !
So I'd better not to touch the hole size and assemble the gaskets as it is.
Thanks again !!!!
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