Competition Package 112cc Combustion Chamber. Suit Big Block Chevy

AFR3640

R3640

For the ultimate in "Oval Port" performance, the fully CNC ported AFR 290 has no competition. With flow figures most small to medium sized rectangular port castings would be envious of, these high flowing "Ovals" produce tremendous airspeed and really pack a punch. Ideally suited for 296-509 CID street and strip performance, as well as circle track applications which require strong low and mid-range torque to help accelerate a car coming off a corner. Once again, AFR has included it's trademark 3/4" deck, reinforced rocker stud bosses, and thick rugged castings, so you can own the strongest and most efficient heads on the market today. Premium hardware such as 2.250/1.880 one piece stainless valves, 1.625 double springs, 10 degree locks and retainers, and high quality studs and guideplates all come as standard equipment. Take note the higher flowing exhaust ports are raised .375 over stock location, and therefore these heads might not be a direct bolt-on in every application. These heads have no EGR. Basic Package Components: 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports 100% CNC Ported Combustion Chambers 3-angle Valve Job/Radiused Exhaust Intake Valve, 2.250" stainless steel Exhaust Valve, 1.880" stainless steel 1.550 O.D. Hydraulic Dual Valve Spring with dampener 170 lbs. on seat, 430 lb open 10° Chrome Moly Retainer 10° Valve Locks Guide Plates Viton Valve Seals Hardened Spring Cup Intake Valve Seats Exhaust Valve Seats Bronze Valve Guides Intake Bronze Valve Guides Exhaust AFR BB Chevy 7/16 Exhaust Studs AFR BB Chevy 7/16 Intake Studs