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AFR Magnum Street Cylinder Head Assembled 2.25/1.88" Valves 290 cc Intake - 113 cc Chamber 725075 They are only to beProduct Description: Cylinder Head Magnum Street Assembled 2. 250 1. 880 in Valves 290 cc Intake 112 cc Chamber 1. 550 in Springs Aluminum Big Block Chevy Pair Advanced FLOW engineering (aFe Power) is a premier designer and manufacturer of automotive performance upgrade systems and components. Current product lines include cold air intake systems, high performance direct fit and racing air filters, exhaust systems, intercoolers, turbochargers,