Piston and cylinder kit 30 DIN Hp (36 SAE) - 80x64mm 1286ccThis Bigbore kit will turn a stock VW 36HP 1191cc into a 1286cc The pistons were designed to work with a 69mm stroke crank, giving you the ability to make a 1387 with all the parts available on the market.. This kit does require machine work on the cylinder heads and case both will need to be opened to accommodate the bigger bore without affecting the reliability.