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AFR 290cc Oval Port Magnum BBC Cylinder Heads
Cylinder Heads, Oval Port, Assembled, Aluminum, 112cc Combustion Chamber, 290cc Intake, Chevy, Big Block, Pair
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Estimated Ship Date from Texas: Monday 10/19/2026 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
3640
Part Type:
Product Line:
Summit Racing Part Number:
AFR-3640
Combustion Chamber Volume (cc):
112
Intake Runner Volume (cc):
290cc
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast aluminum
Camshaft Style:
Hydraulic roller
Intake Port Shape:
Oval
Intake Valve Diameter (in.):
2.250 in.
CNC-Machined Combustion Chamber:
Yes
CNC-Machined Intake Runner:
Yes
CNC-Machined Exhaust Runner:
Yes
Combustion Chamber Style:
Heart
Intake Port Location:
Standard
Exhaust Port Shape:
Round
Exhaust Port Location:
Raised
Intake Valves Included:
Yes
Exhaust Valves Included:
Yes
Exhaust Valve Diameter (in.):
1.880 in.
Valve Springs Included:
Yes
Maximum Valve Lift (in.):
0.725 in.
Outside Diameter of Outer Spring (in.):
1.550 in.
Damper Spring Included:
Yes
Number of Springs Per Valve:
Dual
Retainers Included:
Yes
Retainer Material:
Chromoly steel
Locks Included:
Yes
Lock Style:
10 degree
Valve Stem Seals Included:
Yes
Rocker Arm Studs Included:
Yes
Rocker Arm Nut Thread Size:
7/16 in.-20
Rocker Arms Included:
No
Rocker Arm Nuts Included:
No
Guideplates Included:
Yes
Guideplate Pushrod Size:
3/8 in.
Valve Cover Mounting Style:
Perimeter bolt
Accessory Bolt Holes Drilled:
Yes
Intake Valve Angle:
24/4
Exhaust Valve Angle:
15/4
Valve Guides Included:
Yes
Valve Guide Material:
Bronze
Valve Seats Machined:
Yes
Valve Seat Machine Style:
3-angle
Valve Seat Material:
Ductile iron
Cylinder Head Color:
Natural
Steam Holes Drilled:
No
Oiling Style:
Through pushrod
Machined for O-Ring:
No
Heat Crossover:
No
Remanufactured:
No
Quantity:
Sold as a pair.
AFR 290cc Oval Port Magnum BBC Cylinder Heads
AFR 290cc oval port Magnum BBC cylinder heads feature 100 percent CNC porting on the exhaust, intake, and combustion chambers to provide the ultimate in oval port performance. They produce tremendous airspeed and are ideal for 396-509 cu. in. engines. These heads feature AFR's trademark 3/4 in. deck, reinforced rocker stud bosses, and thick, rugged castings. They're available bare or fully assembled with one-piece stainless steel valves, double valve springs, steel locks, retainers, and guideplates. The cylinder heads also have high-flowing 3/8 in. raised exhaust ports for better performance. Choose the model best suited for your vehicle application.
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Some parts are not legal for use in California or other states with similar laws / regulations
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