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For the ultimate small block Ford street car, youve got to use AFRs all new 165cc emissions legal aluminum cylinder heads. Unlike some aftermarket heads, AFRs performance cylinder heads (CARB EO #250-3) fit all your stock components; no special parts are required! With lightweight 8mm 1.900 intake valves, 1.600 exhaust valve, combustion chamber volume of 58cc, and 68cc exhaust ports, AFRs new 165cc is perfect for 289 and 302 engines operating from idle to 6000 rpm. A 3/4" thick head deck makes it ideal for nitrous or blower applications. These heads will not accept rail rocker arms. Hardened push rods required on all applications. Note: 1986 5.0L must have piston notched for clearance.