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Frequently, steel shim head gaskets are used on hi comp motors. They come in several thicknesses, but none are thick enough to lower your compression. In fact, many times they are used to raise compresion. They ARE the gasket of choice for high compression.
On the compression matter, I'm curious as to why that much was used. To run 12+:1 requires straight racing fuel which is not avialable at every gas pump.
In spite of cost, I would go with getting the pistons changed to lower it to 10:1 at most. Even that with a carbureted engine will still require 100 octane fuel and judicious timing of the engine.
Al
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"If some is good, more is better.
And too much is just enough."
--Carroll Shelby
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