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RWA1528 2.3/2.5 4 cylinder bearing inserts are designed to install a FORD 4 cylinder small journal crank into a FORD 4 cylinder large journal block. These piggy back the FORD 4 cylinder small journal bearings. FORD 4 cylinder small main bearings (RWA1526-1SM, RWA1526-0SM) are required to finish the install.