AFR BBC 300/112cc oval port heads haydraulic roller (pair)
SKU: AFR3670
$7,345.07
| AFR BBC 300/112cc oval port heads haydraulic roller (pair) |
Description
Recommended for agressive street, street/strip or race big block chevys with displacements up to 540 cubic inches operating at or below 6800 RPM. The 300cc oval port cylinder heads feature 100% CNC machined intake runners, exhaust ports and combustion chambers; our 300cc oval port flows 388 CFM at 0.700″ lift and is the ultimate street/race weapon without having to step up to a rectangular port design.
| Included Components | |
| 100% CNC Ported Combustion Chambers | |
| 100% CNC Ported Exhaust Ports | |
| 100% CNC Ported Intake Ports | |
| 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 Dual Valve Spring, 275lbs on seat, .850 Maximum Lift, Max RPM 7400-7600, Uses #8518 Steel Retainer (upgrades available) |
AFR #8031
|
| 10° Steel Retainers 1.500″ O.D x 1.168″ I.D x .844″ I.D |
AFR #8518
|
| PAC Racing #1940 1.550″ OD Hydraulic Roller Dual Valve Spring, 175 lbs. on seat, .725″ maximum lift, Max RPM 6500-6700; Uses #8511 Steel Retainer and #8044 Spring Cup |
AFR #8002
|
| 10° Steel Retainers 1.500″ O.D x 1.120″ I.D x .705″ I.D |
AFR #8511
|
| 10° 11/32″ Valve Keepers with lashcap recess |
AFR #9005
|
| ARP 7/16″ Rocker Studs Intake |
AFR #6407
|
| ARP 7/16″ Rocker Studs Exhaust |
AFR #6406
|
| Adjustable 3/8″ Guide Plates |
AFR #6109
|
| 11/32″ Viton Valve Seals |
AFR #6613
|
| Hardened Spring Cup 1.740” O.D / 1.650” I.D |
AFR #8046
|
| 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 .502″ O.D x 2.10″ O.A.L |
AFR #9041
|
| 11/32″ Exhaust Bronze Valve Guides .502″ O.D x 2.25″ O.A.L |
AFR #9042
|
| 300cc Competition Flow Chart | ||||||||
| .200 | .300 | .400 | .500 | .550 | .600 | .650 | .700 | |
| Int | 161 | 238 | 298 | 342 | 359 | 374 | 384 | 388 |
| Exh | 139 | 191 | 234 | 266 | 275 | 289 | 294 | 298 |
Test conducted at 28″ of water (pressure) on Superflow 1020
Bore Size: 4.500″, 3/4″ radius plate exhaust, 1 7/8″ curved pipe
| Specifications & Features: | |
| Material |
A356 Aluminum
|
| Intake Port Volume |
300cc
|
| Intake Port Dimension |
2.055″H x 1.840″W x1/2 Radius
|
| Intake Port Location |
Stock
|
| Exhaust Port Volume |
135cc
|
| Exhaust Port Dimension |
1.770″H x 2.010″ W
|
| Exhaust Port Location |
.375″ Raised
|
| Combustion Chamber Size (Full CNC) |
112cc
|
| Valve Cover Bolt Pattern |
Perimeter Bolt
|
| Valve Angle |
24°/4° Int, 15°/4° Exh
|
| Valve Spring Pocket Diameter |
1.725″ O.D
|
| Max Valve Spring Pocket Machining |
1.750″ O.D
|
| Deck Thickness |
.750″
|
| Minimum Bore Diameter |
4.250″
|
| Flat Mill |
.006″ per cc/ Maximum 102cc
|
| Angle Mill |
.009″ per cc/ Maximum 97cc
|
| Note: Angle mills might require a .120″ Thick intake gasket. | |
| Minimum Cross Sectional Area |
3.020 sq. in.
|
| Spark Plug Dimensions |
14mm x .750″ w/Gasket Seat
|
| CARB Status: This product is not legal for sale or use on emission-controlled vehicles and intended for dedicated race vehicles only. | |
| Recommended Components: | |
| Intake Port Gasket |
GM #12366985 or AFR #6863
|
| Important: Do not use your AFR gasket as a template to port match your intake manifold as one AFR gasket is used for many AFR runner volumes. | |
| Exhaust Port Gasket |
AFR #6858
|
| Head Gasket |
Fel-Pro #1017-1 (Mark IV) or AFR #6850
|
| Head Gasket |
Fel-Pro #1047 (Mark V and VI) or AFR #6849
|
| Head Bolts |
ARP 135-3703 (Mark IV) or AFR #6306
|
| Head Bolts |
ARP 135-3707 (Mark V) or AFR #6308
|
| Head Studs |
ARP 235-4713 or AFR #6307
|
| Head Bolt Washers |
Manley, AFR #6320
|
| Stud Girdle, (AFR Specific) |
AFR #6202
|
| 7/16 Stud Mount Rocker Arms – 1.7 Ratio (For Optimized Geometry) |
AFR #6043
|
| 1.7 Shaft Mount Rocker Arms T&D |
AFR #6065
|
| Shaft Mount Rocker Arms |
Crower or Jesel Pro Series
|
| Suggested Manifold |
Victor Jr
|
| Suggested Manifold |
AFR Magnum Dual Plane
|
| Spark Plug Starting Range |
Autolite 3924
|
| Note: 1” longer head bolt needed on four bottom exhaust bolt holes. | |
Additional information
| Part Number | AFR3670 |
|---|
