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No, the head gasket bore size refers to the diameter of the bore and should be larger than the cylinder bore. If the engine cylinder has been chamfered at the top of the block, to make it easier to start ring assembly, the the gasket bore size should be at least that diameter. As an example, on a chevy small block with a stock 4 inch bore, the next gasket size is typically 4.030". Engines that have been bored out up to 4.040" will use a gasket size of 4.060". If you use a gasket smaller than the bore size, the gasket will fail as it can create hot spots that will cause pre-ignition. If the gasket bore size is too large it will create a cavity area that prevent a clean burn in the combustion chamber thus creating dirty emissions.

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Q: When purchasing new head gaskets do you want the same bore on the gaskets as the actual cylinder bore?
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