Th H pltfrm, r H-bdy dsgnts Gnrl Mtrs frnt-whl-drv fll-szd cr pltfrm ntrdcd n 1986, nd n mst rspcts dntcl t th frnt-drv C pltfrm ntrdcd fr mdl yr 1985. rgnlly vlbl n bth 2-dr nd 4-dr vrsns — th lttr ws mr pplr nd tw-dr mdls drppd by 1992. ngns wr prdmnntly th Bck's 3.8 ltr (231 cbc-nch) V6 ngn nd ltr, GM's Bck 3800 V6; n ntrlly sprtd nd sprchrgd vrnts (frm 1991 t 1999).
Prvsly, GM hd sd th H pltfrm nmncltr t dsgnt th nrltd rr-whl-drv cmpct crs. Strtng n 2000, ll H-bdy vhcls mvd t th G pltfrm, rltd ls t th K pltfrm. GM cntnd t cll t th H pltfrm.