CATERPILLAR 3408E, COMPLETE CAT REMAN! 3408 V8 631G 231-4505 20R4531, FRESH REMAN ENGINE, REMANUFACTURED BY CATERPILLAR AND NEVER INSTALLED, SOLD EXCHANGE PLUS $10,000.00 REFUNDABLE CORE DEPOSIT.FITS: reman short block # 20R5431, compatible with 769D and 771D trucks, D9R dozers, 631G and 637G scrapers, and 988F wheel loaders., Engine, REMAN VS