AFR 245cc Competition Eliminator SBC Cylinder Heads, 70cc Chambers
AFR's 245cc "Competition" heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings and high quality components throughout. NPP stands for "no pushrod pinch", and this is AFR's largest 60/40 valve spacing head. These heads require shaft mount rocker arms for all applications and have extra machining for 3/8" pushrod clearance. Component upgrade and machining options are available to customize AFR Heads to your specific build.
Shipping: FREE continental USA ground shipping on ALL AFR Cylinder Heads
AFR is proud to introduce the new 245 NPP (no pushrod pinch); best suited for max effort applications, but larger displacement 427+ pump gas engines could consider this head as well. This exciting product represents the best flowing 23° SBC head to date and while flow numbers may reflect a very good 18° head of the past, this head is still a conventional direct bolt on non-raised runner intake port configuration. It will drop on your 23° shortblock as easily as the 227cc or 235cc AFR SBC product and in fact shares identical valve centerlines and rocker stud locations to both of those heads. However, unlike the 227 and 235 cc heads, this product will not accept stud mount style rockers and a shaft mount rocker system with the proper intake offset must be used. This is primarily due to the enlarged and widened pushrod pinch removing that checkpoint in the entrance of the intake allowing AFR to design a port with a more direct shot at the back of the valve that also has a more consistent cross sectional area and velocity profile. In addition, this head comes standard with a 3/4 inch deck, 2.125 intake and 1.600 exhaust. If you are unsure if this is the right AFR head for you, we encourage you to contact us directly to discuss your combination. Dual valve cover bolt pattern is standard.
The exhaust ports are raised .250" over a standard GM L-98 cylinder head.
2.125 valves will require aftermarket pistons notched for valve clearance.
|Basic Package Components||Part #|
|100% CNC Ported
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
|8mm Bead Lock Intake Valve, 2.125" x 5.00" long||AFR #7253|
|8mm Bead Lock Exhaust Valve, 1.600" x 5.030" Overall Valve Length||AFR #7254|
|PAC Racing Springs 1.550" OD Solid Roller Dual Valve Spring Pac #1225, 250 lbs on seat, .800" maximum lift, Max RPM 8000-8200||AFR #8001|
|Manley 10° Steel Retainers 1.500" O.D x 1.120" I.D x .705" I.D||AFR #8511|
|10° Bead Lock Valve Keepers with lashcap recess||AFR #9009|
|Viton Valve Seals .600" O.D x .495" I.D||AFR #6612|
|Hardened Valve Spring I.D Locator 1.550" O.D x .780" I.D||AFR #8048|
|Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep||AFR #9060|
|Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep||AFR #9070|
|Bronze Valve Guides||AFR #9051|
|Specifications, Features, and Optional Supporting Components|
|Intake Port Volume||245cc|
|Intake Port Dimension||2.200" H x 1.300" W 7/16 Radius|
Intake Port Location
|Exhaust Port Volume||80cc|
|Exhaust Port Dimension||1.465" H x 1.570" W|
|Exhaust Port Location||.250" Raised|
|Combustion Chamber Size||70cc or 80cc|
Valve Cover Bolt Pattern
|Valve Spring Pocket Diameter||1.580" O.D|
|Max Valve Spring Pocket Machining||
|Minimum Bore Diameter||4.000"|
|Flat Mill||.006" per cc 60cc Maximum|
|Angle Mill||.009" per cc 55cc Maximum|
Minimum Cross Sectional Area
|2.730 sq. in.|
|Note:Angle mills might require a .120" Thick intake gasket.|
|Spark Plug Dimensions||14mm x .750" w/Gasket Seat|
|Non Emissions Compliant|
|Shaft Mount Rocker Arms,||T&D .450" offset (requires .180 offset lifters)|
|Shaft Mount Rocker Arms||T&D .550" offset (with standard lifters)|
|Intake Gasket 1.280x2.090 w/ 3/8" radius, Fel-Pro #1206||AFR #6820|
|Exhaust Port Gasket, Fel-Pro #1405||AFR #6835|
|Head Gasket, 350cid Fel-Pro #1004||AFR #6801|
|Head Gasket, 400cid Fel-Pro #1014||AFR #6802|
|SB Chevy Head Bolt Kit, ARP #134-3701||AFR #6310|
|SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301||AFR #6305|
|Head Bolt Washers, Manley||AFR #6320|
|Suggested Manifold||AFR Titan TXR #4801
Titan TXS #4802
|Spark Plug Starting Range||Autolite 3922|
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.
- Item Requires Shipping
- 65.0 lbs.
- W12.0000” x H12.0000” x L24.0000”
- This item ships in its own box.
- FREE continental USA ground shipping on ALL AFR Cylinder Heads
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