Leading A-Series engine specialist since 1981
The MED four-bolt steel main cap adds much strength to the centre of the block where crankshaft 'whip' is most prevalent. For reliability, we consider this upgrade essential for any high RPM race engine.
Designed for all 1275 engines (excluding the original Cooper S), the cap is CNC machined from EN8 steel stock and supplied with a pair of dowels.
Please note, the block will need to be drilled/tapped to accept the outer two fixings and then line-bored.
You may wish to consider the complete MED steel main cap set.
We'd highly recommend using the MED AFS main stud conversion rather than standard bolts.