GM Small Block Aluminum Exhaust Manifold | BARR CHV-1-92GM Small Block Aluminum Exhaust Manifold BARR CHV 1 92 Generic lightweight aluminum center rise manifold for GM 283, 305, 307, 327, & 350 cu. in. marine engines. Barr aluminum GM small block exhaust manifold Generic center rise manifold for GM V8 small block engine applications Same as CHV 1 83 but made of 356 T6 aluminum Interchangeable between port and starboard side Includes with gaskets and mounting hardware Water cooled 3 4 in. NPT cooling hose