Piston Kit - 124" - Standard - M8Updates stock 107", 114 or 117 motor to 124 or 128 when using 4. 250 big bore cylinders. Valve pockets are designed to accept up to +4. 00 mm oversized intake and exhaust valves. Type 3 hard anodized crown offers corrosion resistance for alcohol added fuels. Type 3 hard anodized top ring groove eliminates micro welding of ring to the groove and gives a hard flat surface for ring to rotate on. OE style round wire locks are easily installed. Heavy duty