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Old 09-01-2010, 07:55 PM
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which way up? steel shim gaskets

Alright im searching and cant figure this out...feeling real dumb right now but i just bought steel shim gaskets for my 350 and im trying to figure out which side faces the head

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Old 09-01-2010, 08:20 PM
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another problem im running into is the cooling passages.
the cooling passages in the heads and block are large like the size of a quarter but the cooling passages on the gasket are small toothpic size holes. Everything else seems to match up perfectly though.
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Old 09-01-2010, 08:42 PM
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Hi,
I've never used shim gaskets so I don't know what side is up. But I can tell you about the water passage hole size, if they were as large as the casting holes the water would just go in the front of the engine & then back out to the rad, the water at the rear of the engine would just lay there, now with the small holes in the gasket the water is forced through causing the water in the rear & rest of the block to swirl and circulate.
Rich
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Old 09-01-2010, 08:51 PM
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i guess that makes sense. i cant figure out these gaskets. everything im reading says it doesn't matter if it doesnt say top on it. But im gonna wait for an answer anyway
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Old 09-01-2010, 09:19 PM
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It doesn't matter, they can go either side up.

Richard is correct about the size of the holes in the gasket being small to force the circulation path to be what is needed. The holes in the block are larger because they need to be that big for the foundry to be able to get the caked casting sand out of the cooled casting. Heads have bigger holes in the deck than the gasket for the same reason, to get the sand out.

The upper gasket holes are small because the intake port side of the head is cooler, and to force the water flow to mostly be on the hotter exhaust port side of the head.
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Old 09-01-2010, 09:58 PM
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The steel shim has ridges for sealing to the head, these should point up.
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Old 09-02-2010, 08:11 AM
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I was looking thru MrGasket's Head gasket specs last night, looking up a 400SBC gasket. Ran across some Info on Shim gaskets I've never heard. It said Do Not Use Shim style Head gaskets with light weight head castings as they don't have enough material at the edge of head to seal properly. Never heard this before.
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Old 09-02-2010, 10:45 AM
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Quote:
Originally Posted by automotive breath
The steel shim has ridges for sealing to the head, these should point up.
Beveled side goes up. I have shims on mine and recall researching this.
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Old 09-03-2010, 12:46 PM
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Quote:
Originally Posted by V8 Super Beetle
Beveled side goes up. I have shims on mine and recall researching this.
Nice to know that I got the first one right, Im about to go do the other one in a few moments..
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