“455 MP cam”, From what I’ve been told, Mopar used to have a .455/.455, 272/272-112 cam for the small blocks.
It disappeared from the line up somewhere in the late 90’s, early 00’s....... but was available for the BB for a while longer.
I bet that’s whats in there.
P4286671 ..hydraulic cam and tappet package for light competition applications. Offers good mid-range torque and good power 272-272-48*, valve lift .455, centerline 112*
only other cam with 455 lift that year
P4452761 ..hydraulic cam and tappet package for light competition. Offers good mid-range torque and good power 268-272-50*, valve lift .450/.455, centerline 110*
1989 Mopar Performance Catalog. Small block camshafts p. 80, 81.
and your sources are good. :) Big block version in '90 catalog but the small block version was gone.
