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AFR 300cc BBC Oval Port Cylinder Heads, CNC Ported, Solid Roller Springs
AFR 3680
AFR's 300cc heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. Recommended for aggressive street, street/strip or race builds with displacements up to 540 cubic inches, operating up to 6800 RPM. Component upgrades and machining options are available to customize AFR Heads to your specific build.
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
Was:
$4,175.75
Sale:
$3,875.75
Save:
7%
Save:
$300.00
Description
For the ultimate in "Oval Port" performance with solid roller springs, the fully CNC ported AFR 300 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. 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 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 and are not emissions legal.
Note:
1" longer head bolts needed on four bottom exhaust bolt holes. Angle mills might require a .120" Thick intake gasket.
| Basic Package Components | Part # |
| 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports 100% CNC Ported Combustion Chambers Competition 5-angle Valve Job | |
| 11/32" Intake Valve, 2.300" x 5.500" O.A.L | AFR #7626 |
| 11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length | AFR #7630 |
| PAC Racing Spring #1224 1.625 O.D. Solid Roller, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600, Uses #8518 Steel Retainer (upgrades available) | AFR #8031 |
| 10° 11/32" Valve Locks with lashcap recess | AFR #9005 |
| ARP 7/16" Rocker Exhaust Studs | AFR #6406 |
| ARP 7/16" Rocker Intake Studs | AFR #6407 |
| Adjustable 3/8" Guide Plates | AFR #6109 |
| 11/32" Viton Valve Seals | AFR #6611 |
| Spring I.D Locator 1.550" O.D x .780" I.D | AFR #8048 |
| Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep | AFR #9065 |
| Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep | AFR #9064 |
| 11/32" Intake Bronze Valve Guides .531" O.D x 2.10" O.A.L | AFR #9045 |
| 11/32" Exhaust Bronze Valve Guides .531" O.D x 2.25" O.A.L | AFR #9046 |
| Specifications, Features, and Optional Supporting Components |
| Head Torque | 75 ft. lbs |
| Intake Port Gasket | Mr. Gasket #107 or GM #12366985 |
| Exhaust Port Gasket | AFR #6858 |
| Head Gasket, Fel-Pro #1047 (Mark V and VI) | AFR #6849 |
| Head Gasket, Fel-Pro #1017-1 (Mark IV) | AFR #6350 |
| Head Bolts, ARP 135-3703 (Mark IV) | AFR #6306 |
| Head Bolts, ARP 135-3707 (Mark V) | AFR #6308 |
| Head Studs, ARP 235-4713 | AFR #6307 |
| Head Bolt Washers, Manley | AFR #6320 |
| Suggested Manifold | RPM PerformerVictor Jr., |
| Spark Plug Starting Range | Autolite 3932 |
| Combustion Chambers | 112cc with CNC Chambers |
| Valve Spring Pocket Diameter | 1.725 O.D |
| Intake Port Dimension | 2.055"H x 1.840"W x1/2 Radius |
| Exhaust Port Dimension | 1.770"H x 2.010" W |
| Valve Angle | 24°/4° Intake, 15°/4° Exhaust |
| Angle Mill (Milling options available) 97cc max | .009" per cc |
| Flat Mill (Milling options available) 102cc max | .006" per cc |
| Stud Girdle, (AFR Specific) | AFR #6202 |
Important: Do not port match you intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads.
Note: Milling head deck will affect flow numbers. 1" longer head bolts needed on four bottom exhaust bolt holes. Angle mills might require a .120 thick intake gasket.
Details
- AFR 3680
- AFR 3680
- Air Flow Research
- New
Shipping Information
- Item Requires Shipping
- 80.0 lbs.
- W24.0000” x H12.0000” x L24.0000”
- Free Basic Shipping
- This item ships in its own box.
- FREE continental USA ground shipping on ALL AFR Cylinder Heads
- TRE Performance Difference
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