Hi Po Engine Id Guide
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The Hi-Po piston in all of its cast aluminum glory (there were no forged pistons in the Hi-Po, contrary to what has been written). The pistons were designed to clear the valves at high lift with valve reliefs in the pistons. Ford had four reliefs cast in so the pistons could be used on either side of the engine during assembly (the notch denotes forward facing when installed in the block). View Related Article
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