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1949-53 Ford Flathead Finned Aluminum Heads These Offy flathead Ford heads are finned for high heat dissipation, bigger water capacity for “built” engines and everybody knows, nothing beats a full-dress flathead for beauty! Heads have a .400″ valve relief. 3-5/16″ bore, 4″ stroke = 9:1 compression ratio 3-5/16″ bore, 3 3/4″ stroke = 8.6:1 compression…