This is a 20-piece bolt + washer fastener kit to secure the Mercury Racing Hi-Performance Cylinder Block Halves (245 HP, 260 HP, 280 HP, ROS, 300 Drag) around 10 exterior (5 per side) threaded screw/bolt holes.
Includes the ten (10) 12-point specialty bolts and ten (10) stainless case-hardened thick washers (.401 x .745 x .097).
Mercury OEM part numbers 10-8231991 and 12-822838, MSRP $97.89
20 Hi-Perf Cylinder Block Bolt + Washer Kit
SKU: GBBK-77
$40.00Price