B20-0107 Barr aluminum sbc Merc riser w/hdwr.
Aluminum small block Chev riser including mounting hardware and gasket fits Barr BCHV-1-92 aluminum manifold or will fit the Barr BCHV-1-83 cast iron manifold too. Used with the 4" I.D. MerCruiser exhaust system. The photo shown is a MerCruiser item-this one fits the Barr manifold-not the MerCruiser manifold. Save around 100 pounds per engine for improved performance and economy!