Exhaust Manifold To Head Gasket | Barr Marine CHVA-47-0000Exhaust Manifold To Head Gasket Barr Marine CHVA 47 0000 Barr Marine Exhaust Manifold To Head Gasket CHVA 47 0000 Gasket seals between exhaust manifold & cylinder head on GM V8 big block marine engines. Barr GM small block manifold to head gasket Replaces Barr CHVA47 0000 Replaces Mercruiser 27 46820 Replaces Volvo Penta 3852472 Replaces Crusader 96653