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These forged aluminum pistons have many special features and are made especially for Smeding Performance. The wristpin has been moved up to accept the 6.200-inch connecting rod length, but not so far as to intrude into the oil-ring lands (like early 347 kits, which burned oil). The pistons have a special channel between the first and second ring to act as a reservoir and catch and hold any compression getting around the top ring. The crowns are contoured to accept big valves, and when combined with the other components in our recipe, these pistons will give a compression of 10.2:1, easily handled on pump gas.