New factory Mazda OEM cylinder head to engine block alignment dowel for NA and NB Mazda Miata. This is one of the two 15mm metal cylinders that sit in the corners of the top of the engine block and align the cylinder head when it is mounted on top. Also known as engine block to cylinder head alignment pin. Part number B630-10-306. Fits 1990-2005. Sold individually as one alignment dowel.
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