Updates stock 107", 114ö or 117ö motor to 124ö or 128ö when using 4.250ö 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 wrist pins with true .9270ö diameter to fit rods correctly Line2Line AST skirt coating starts out with a near-zero wall clearance and through the break-in period hones the cylinders to produce the correct oil wedge, keeping the piston square to the cylinder for best ring seal and quiet operation Kit includes pistons, rings, pins and locks. PISTON KIT M8 124" STD