- Engines & Components
- Cylinder Heads
- AFR Big Block Chevy 290cc Oval Port Magnum Aluminum Cylinder Heads
AFR's Medium Sized Oval Port
Big Block Chevy Powerhouse!
For incredible 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 396-509ci 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.
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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, 1.550'' 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 and bolt pattern are raised .375'' (3/8'') over stock location, this rarely affects chassis fitment. These heads have no EGR and are not emissions legal. .
Installation Notes: Optional stud girdle required for 2° rolled valve angles and 1'' longer head bolt needed on four bottom exhaust bolt holes.
290cc Oval Port Magnum Street Cylinder Head Features:
- 100% CNC Ported Combustion Chambers
- 100% CNC Ported Exhaust Ports
- 100% CNC Ported Intake Ports
- Competition 5-angle Valve Job
- 290cc Intake Ports
- Intake Valve, 2.250'' x 5.500'' Overall Valve Length
- Exhaust Valve, 1.880'' x 5.448'' Overall Valve Length
- Hydraulic Roller Valve Spring: 1.550'' OD Hydraulic Roller Dual Valve Spring, 170 lbs on seat, 473 lbs @ .600'' maximum lift
- Solid Roller Valve Spring: 1.550'' OD PAC Racing Solid Roller Valve Spring, 225 lbs on seat, .680'' maximum lift
- 10° Manley 4140 Chrome Moly Retainers
- 10° Valve Locks
- 7/16'' Rocker Studs
- Adjustable 3/8'' Guide Plates
- Viton Valve Seals
- Hardened Spring Seats
- Intake Valve Seats
- Exhaust Valve Seats
- Bronze Valve Guides