This is a A-3800750 Upper Gasket Set PN: 3800750Main Description As Following : A-3800750 Gasket Set; Upper P.N: 3800750 A-3800750 Gasket Set; Upper P.N: 3800750 Replaces: C3800750 MAXIFORCE 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