I noticed on the Stage 1 T/A aluminum intake manifold for the 350, the rear coolant passageways are blocked off. There are port passageways in the heads so why is the manifold designed not to allow coolant to flow through? I dunno. Any info on this manifold would be helpful. Oh yeah, the intake has the name "Tom Aszewski" cast to the rear of where the carb sits and the engine is a 1970 350 with the SB heads.