911 / 930 / 964 / 993 RSR C-Case Through Bolt This bolt can be used to "Shuffle Pin" the crank case and allow easy disassemble of the engine for routine maintenance and Repair, this method of case pinning was used on all the factory 935 engines to prevent the crankshaft being nipped as the cases distorted through the increase in power, these bolts are specially made to be used in the later cases, some case machining is necessary to accommodate the bolts and the new oil sealing arrangement. We also have the same type of bolt for early 911 crank cases. - £102.00