This listing is for a brand new High Volume ( Adds 25% morevolume) Oil pump, ARP mounting Stud, Pick Up Screen and Oil pump drive rod from Melling that is made in the USA. The IS77 driveshaft has the steel shaft guide manufactured in which eliminates the stock style nylon guide. With pick up tube diameter 3/4". These are compatible replacements for the following big block Chevrolet and GMC engines. (366 CID (6.0L) 1973-1998 396 CID (6.5L) 1965-1971 402 CID (6.6L) 1970-1972 427 CID (7.0L) 1966-1969 All Passenger Cars. 427 CID (7.0L) 1976-1998 All Trucks 454 CID (7.4L) 1970-2000 496 CID (8.1L) 2001-2007 Vortec 8100 L18 Trucks.