Big bore kit includes Alloy cylinder 4.1kgs with spun cast iron liners , pistons complete, set of chrome moly steel high strength pushrods, set of special high tensile head bolts, solid copper head gasket, Compression is approximately 8.75:1 with thick gasket. Also available separately is a base stud kit for converting the early cases to take the 3/8 studs, our part number SRMSP3H , stud kit is stainless steel studs and stainless steel nuts and washers. Big bore kit is 79mm standard and can be rebored to 79.5mm.
Suitable for use with standard crank and conrods and standard head, it is advised that cylinder head is gas flowed with big valves, our part number VB50SP to gain max power. We also have a range of camshafts to suit.
Note that crankcase mouth will have to be be machined out slightly to take the larger bore spigots and also clear the cam follower guide spigots. SRM can do this work for a small charge of £52.56 , crankcases will have to be stripped down to bare cases for this work to be carried out.