This is a A-3800348 Lower Gasket Set PN: 3800348Main Description As Following : A-3800348 Gasket Set; Lower P.N: 3800348 A-3800348 Gasket Set; Lower P.N: 3800348 Replaces: C3800348 MAXIFORCE , Crossed From: HCK3800558 , , 1709-3001 , Found in Section & Models : Engine Parts > 6-830T Turbo Charged Cummins "C" Series, Case-IH COMBINE: 1660, Case-IH COMBINE: 1666 (Engine SN 44706126>), Case-IH COMBINE: 1670 (Engine SN <44706125), Case-IH COMBINE: 1680 (Engine SN <44706125), Case-IH COMBINE: 2166 (SN