This is a A-57798D Valve, Exhaust PN: 57798DMain Description As Following : A-57798D Valve, Exhaust P.N: 57798D Used w/ SN 255418-310299w/ 4.94 valve length Crossed From: HCRP57798D , , HC757798 , Found in Section & Models : Engine Parts > C113 CID, Case-IH TRACTOR: C, Case-IH TRACTOR: SUPER A (SN 255418-310299), Case-IH TRACTOR: SUPER AV (SN 255418-310299), Engine Parts > C123 CID, Case-IH TRACTOR: SUPER AV (SN 310300>), Case-IH TRACTOR: SUPER AV1 (SN 310300>), Case-IH TRACTOR: SUPER C, Case-IH TRACTOR: 100, Case-IH TRACTOR: 200 Associated Items : New Also A-CA-O-C, A-CA-P-CC, A-CA-P-MAG, A-CA-S-MAGNETO, A-CA-S-TOOLS, A-FRM-IHOL, A-IH-C-DOMGENCAT, A-IH-C-MUSCLES, A-IH-C-1936FULL, A-IH-O-C, A-IH-O-C1952, A-IH-P-ACCESSORY, A-IH-P-C, A-IH-P-IMPCSUPC, A-IH-S-CARBSPEC, A-IH-S-ENGGASE, A-IH-S-TOUCHCTL, A-IH-S-TUNEUP, A-MAG-S-317, A-SMC201 And : Used w/ SN 255418-310299 w/ 4.94 valve length