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AFR 300cc Magnum BBC Cylinder Heads
Cylinder Heads, Magnum, Assembled, Aluminum, 113cc Chamber, 300cc Intake, Oval Intake Port, Round Exhaust Port, Chevy, Big Block, Pair
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Estimated Ship Date: Jan 4, 2027 Would you rather pick it up?
Overview
Brand:
Manufacturer's Part Number:
3670
Part Type:
Product Line:
Summit Racing Part Number:
AFR-3670
Item Number:
2426638
Combustion Chamber Volume (cc):
113
Intake Runner Volume (cc):
300cc
Cylinder Head Style:
Assembled
Cylinder Head Material:
Cast aluminum
Camshaft Style:
Hydraulic roller
Intake Port Shape:
Oval
Intake Valve Diameter (in.):
2.300 in.
CNC-Machined Combustion Chamber:
Yes
CNC-Machined Intake Runner:
Yes
CNC-Machined Exhaust Runner:
Yes
Combustion Chamber Style:
Semi-open
Intake Port Location:
Standard
Exhaust Port Shape:
Round
Exhaust Port Location:
Standard
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:
No
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
Exhaust Valve Angle:
24
Valve Guides Included:
Yes
Valve Guide Material:
Bronze
Valve Seats Machined:
Yes
Valve Seat Machine Style:
5-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 300cc Magnum BBC Cylinder Heads
AFR 300cc Magnum BBC cylinder heads are suggested for aggressive builds. They boast 100 percent CNC-ported intake, exhaust, and chambers—as well as A356 aluminum casting and high-quality components throughout. These oval port competition packages are available with hydraulic or solid roller springs; and bare or assembled style.
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Instructions & Calculators
Some parts are not legal for use in California or other states with similar laws / regulations
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