High compression, dish-top 3-ring 1275cc piston from OEM supplier. Ideal for Cooper S spec 1275cc road engines. Thin-ring low-friction design is stronger than 21251 piston in area of oil control ring. Supplied with rings and pin. Sold each.

Assembly Note: This piston will normally fit an undecked block, but the taller compression height of 1.5276" requires checking piston/deck clearance by test installing a single piston on the rod and attached to the crank. This is especially important when the block has previously been decked. Additionally, if you are taking your 1275 rods to a machine shop for piston installation, please note the offset of the rods in the block and advise your machine shop of the exact orientation. This is a somewhat unusual feature of the 1275cc engine and the shop must be made aware to prevent installation error.

Single piston replacement ring sets available separately, see R41570.

PACKAGING UPDATE: Item(s) may be packaged in either style shown, but please be assured that the same item(s) are in each. AE Hepolite is now owned by Federal Mogul and trademarked "Nural"