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This is a 20-piece fastener kit to secure the Mercury Racing Hi-Perf Cylinder Block Halves (245 HP, 260 HP, 280 HP, ROS, 300 Drag) around 0 exterior screw holes.


Includes ten (10) 12-point specialty bolts and ten (10) 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

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