Exhaust Manifold Crusader Big Block Port | Barr Marine CR-1-97993 Direct replacement port side log style exhaust manifold for Crusader 454 cu. in. & 502 cu. in. marine engines. Barr Crusader marine exhaust manifold Direct replacement exhaust manifold for Crusader port side big block 7.4L 454 cu.in. 8.2L 502 cu. in. marine engine Heavy duty cast iron Painted Blue Includes gaskets, mounting hardware, and pipe plugs Replaces Crusader 97993 Replaces Osco 7933 Replaces Sierra 18-1933