Small Port, High Velocity, Torque Monster!
Want to wake up the Big Block in your favorite race vehicle? AFR's 265cc high velocity oval port is just the ticket! They are also ideal on smaller cubic inch street performance applications (up to 468 CID), providing “gobs” of bottom end torque, tremendous throttle response, and great all around power. With AFR’s trademark 3/4” deck, reinforced rockerstud bosses, and thick rugged castings, you can own the strongest and most efficient heads on the market today. This Race Ready upgrade includes PAC Racing Spring 1.550 O.D. Solid Roller Valve Spring, 220lbs on seat, .710" Maximum Lift, Max RPM 7200-7400 (upgrades available) and CNC Chambers. 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.
Included Components |
Part # |
75% CNC Ported Exhaust Ports (Bowl Blend) 80% CNC Ported Intake Ports (Bowl Blend) 100% CNC Chambers Competition 5-angle Valve Job |
|
11/32" Intake Valve, 2.190" x 5.460" Overall Valve Length |
AFR #7601 |
11/32" Nail Head Exhaust Valve, 1.880" x 5.450" Overall Valve Length |
AFR #7630 |
PAC Racing Springs 1.550” OD Solid Roller Dual Valve Drag Race Spring, 220 lbs. on seat, .710” maximum lift, - 260* max recommended duration, Max RPM 7200-7400 (upgrades available) |
AFR #8000 |
PAC Racing #1940 1.550” OD Hydraulic Roller Dual Valve Spring, 175 lbs. on seat, .725” maximum lift, Max RPM 6500-6700 |
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 Valve Spring Cup 1.655" O.D x 1.565" I.D – For 8002 Spring |
AFR#8044 |
Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D - For 8000 Spring |
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 .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 |
Intake Port Gasket |
AFR #6863 |
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 |
RPM Performer |
Suggested Manifold |
Air Gap #7561 |
Spark Plug Starting Range |
Autolite 3924 |
Specifications & Features |
Material |
A356 Aluminum |
Intake Port Volume |
265cc |
Intake Port Dimension |
2.030"H x 1.830"W x1/2 Radius |
Intake Port Location |
Stock |
Exhaust Port Volume |
132cc |
Exhaust Port Dimension |
1.770"H x 2.010" W |
Exhaust Port Location |
.375" Raised |
Combustion Chamber Size (Partial CNC) |
109cc |
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 |
4.125" |
Flat Mill |
.006" per cc/ Maximum 102cc as cast or CNC chamber |
Angle Mill |
.009" per cc/ Maximum 97cc as cast or CNC chamber |
Minimum Cross Sectional Area |
2.640 sq. in. |
Spark Plug Dimensions |
14mm x .750" w/Gasket Seat |
IMPORTANT:
Do not match your intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads.
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.
NOTE:
1" longer head bolts needed on four bottom exhaust bolt holes.
Milling head deck will affect flow numbers. Angle mills might require a .120 thick intake gasket.