The ACL Race Series rod bearing set for Ford B/D series 1099–1700cc is provided in .25mm (0.010") undersize to match journal machining requirements on Cosworth-series 1601cc inline-four DOHC engines. This connecting rod bearing set description emphasizes the specified undersize dimension and its use with the BDA/BDB/B... family where that machining size is required.
ACL Ford 4 BD Series 1099-1700cc 010 Oversized High Performance Rod Bearing Set