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Old 10-08-2006, 08:29 PM
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Header Gasket Question

I just recently bought a set of block hugger headers for a small block 350 Chevy engine. The application sheet stated these were the headers for this engine but when I received them I noticed the ports on the headers are round and the ports on the heads are square. (It seams they should be the same)

When you go to buy your copper gaskets, are you supposed to buy the round ones to fit the headers or the square ones to fit the heads?

Or do I have the wrong headers? Which means their application chart is wrong?

Which side of the copper gasket goes toward the heads? One side of the gasket is raised, and there is no indication in the directions.

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Old 10-08-2006, 10:20 PM
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Wow. That header mismatch sounds kind of wacked! This may be a common thing for those guys that are in the business of installing headers, I don't know. I would have to look at the gaskets to make sure that the square one, which I would try to use first, would provide enough sealing surface for the header to prevent it from blowing out and then if that one didn't seem to work, try the other. Remember that the raised area has to be between the header and the head to get a good crush and seal. As far as the gaskets go, I always install the dimpled, raised surface away from the block or head so that the part being installed seals to the engine.
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Old 10-09-2006, 12:15 PM
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I run a big block but the header tubes are round and the heads are square.If you use the square gaskets it will leak because in the corners only a little bit of the gasket is sealing and it will leak.Use the round gaskets.Also make sure the flanges are flat or they wont seal against the head.I had to make a relief cut between the tubes on mine to get it to seal but you shouldn't have to on a new set.
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