73.5mm with 11cc dish. The "Mega" range of pistons was introduced to make reasonably priced competition pistons more readily available. Manufactured by in the UK by AE in special double heat-treated aluminum, the pistons feature an anti-friction design, modern ring pack, and tapered wrist pin. Sold by the set of four.
Offset boring recommended, especially for racing engines, but not necessarily required for road cars, depending on the block to be used. Offset boring is more expensive than standard boring, and fewer places will attempt it, since it requires different machining equipment than is found in most machine shops.