CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.
Recommended for aggressive 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.
| 300cc Aluminum BBC Cylinder Heads | ||
|---|---|---|
| Part # | Description | Combustion Chamber |
| 3670 | Fully CNC Ported - Hydraulic Roller | 112cc |
| 3680 | Fully CNC Ported - Solid Roller | 112cc |
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| 300cc BBC | ||||||||
| .200 | .300 | .400 | .500 | .550 | .600 | .650 | .700 | |
| Int | 165 | 240 | 300 | 345 | 369 | 380 | 390 | 394 |
| Exh | 135 | 185 | 234 | 266 | 285 | 295 | 301 | 314 |
Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.500", 3/4" radius plate exhaust, 1 7/8" curved pipe
| Included Components | |
| 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 |
7626
|
| 11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length |
7630
|
| 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 #8048 Spring Cup |
8002
|
| 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) |
8031
|
| Manley 10° Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D |
AFR #8511 for spring #8002
|
| Manley 10° Steel Retainers 1.500" O.D x 1.168" I.D x .844" I.D |
AFR #8518 for spring #8031
|
| 10° 11/32" Valve Locks with lashcap recess |
9005
|
| ARP 7/16" Rocker Exhaust Studs |
6406
|
| ARP 7/16" Rocker Intake Studs |
6407
|
| Adjustable 3/8" Guide Plates |
6109
|
| 11/32" Viton Valve Seals |
6610
|
| Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D |
8046
|
| Intake Valve Seats 2.450" O.D x 1.950" I.D x .375" Deep |
9065
|
| Exhaust Valve Seats 2.000" O.D x 1.580" I.D x .375" Deep |
9064
|
| 11/32" Intake Bronze Valve Guides .502" O.D x 2.10" O.A.L | 9047 |
| 11/32" Exhaust Bronze Valve Guides .502" O.D x 2.25" O.A.L |
9048
|
| Recommended Components: | |
| Intake Port Gasket |
6863
|
| Important: Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads. | |
| Exhaust Port Gasket |
6858
|
| Head Gasket, Fel-Pro #1047 (Mark V and VI) |
6849
|
| Head Gasket,, Fel-Pro #1017-1 (Mark IV) |
6850
|
| Head Bolts, ARP 135-3703 (Mark IV) |
6306
|
| Head Bolts, ARP 135-3707 (Mark V) |
6308
|
| Head Studs, ARP 235-4713 |
6307
|
| Head Bolt Washers, Manley |
6320
|
| Stud Girdle, (AFR Specific) |
6202
|
| 7/16 Stud Mount Rocker Arms - 1.7 Ratio (For Optimized Geometry) |
6043
|
| 1.7 Shaft Mount Rocker Arms T&D |
6065
|
| Suggested Manifold |
Victor Jr
|
| Suggested Manifold |
RPM Performer
|
| Spark Plug Starting Range |
Autolite 3924
|
| 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
|
SHIPS IN THE LOWER 48 STATES FREE!
CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.
CONTACT US THE PRICE IS NEGOTIABLE BEST OFFER
Warning: May cause cancer and reproductive harm.
