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Original Message
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| First off, there are 2 completely different types. |
| By Dave Shoe - 09/07/2003 12:09:45 AM; IP 216.243.176.34 |
Be aware there are the "simple embossed" type of steel shim head gaskets which remain readily available. These work well in bores up to 428, but do not fit the larger 427 bore. These were common on production FEs for many years.
The "simple embossed" shim gaskets are NOT the ones we refer to.
Instead, we are referring to the "reinforced" shim gaskets which have a rolled lip at the cylinders to improve cylinder sealing when there is so little space separating the large 427 bores. These gaskets work well in smaller bores, but are designed for the 427.
More info can be gleaned from this older post, though I've noted there are a couple errors in it:
http://jcoconsulting.com/forumfe/reply.aspx?ID=7888&Reply=7880
Another feature of the C3AZ-B's is they are a wet-deck gasket. In other words, coolant passages are NOT sealed, allowing coolant to wick into the uncrushed space between the head and deck to help transfer combustion chamber heat to the block.
Oddly, I still use Permatex copper-coat head gasket sealer with these gaskets with perfect luck. This reduces the coolant wicking a little, since the copper goo is all over the place, but the coolant still mananges to fill the remaining air spaces, providing some thermal mating between the head and block, thus reducing hot spots on the head.
Some folk have trouble with the shim gaskets leaking coolant like crazy when they are installed. I have not learned why this is, but they were experienced builders, so beware some folk have had less than perfect luck with them.
Shoe. |
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This thread, so far...
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