Boulevard Bully
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Notice the oil feed hole for the main bearing. In the original IA block and this prototype, the block oil feed hole did not line up with the main-bearing feed hole, so slight mods were needed. This issue has been fixed in the production IA II blocks. A BOP rear main seal is used because the IA II does not have the factory's anti-rotation divots in the block or in the main cap. Also visible in this picture is the crosshatch on the cylinder walls to accommodate the moly rings. View Related Article
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