Afr 245cc Competition Eliminator Sbc Cylinder Heads, Spread Port, 80cc Chambers, Titanium Retainers

Spread port heads have the center exhaust ports spread apart approximately 1/2" over stock GM heads. The reason for spread port heads is to achieve additional cooling in the center of the head where the heat concentration is greatest. As standard headers do not fit, spread port headers are required since the center ports are spread further apart than stock GM products. The increased spacing on the exhaust port also requires the use of exhaust gasket Fel-Pro #1409. Spread port heads only come with a Stahl bolt pattern. AFR's spread port head has all the benefits and features of AFR's standard head. As all benefits and features are the same, please review respective page for product details (i.e. for 210cc spread port view 210cc SBC "Eliminator").
The Best 23? Spread Port AFR Head Ever Produced!
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. Drilling for centerbolt valve covers available as an option.
The exhaust ports are raised .250" over a standard GM L-98 cylinder head.

Note:
2.125 valves will require aftermarket pistons notched for valve clearance.

Basic Package Components Part # 100% CNC Ported Combustion Chambers
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 10? Titanium Retainers 1.490" O.D x 1.115" I.D x .745" I.D.
AFR #8505 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
Head Material A356 Aluminum Intake Port Volume 245cc Intake Port Dimension 2.200" H x 1.300" W 7/16 Radius Intake Port Location Stock 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 Perimeter Bolt Valve Angle 23? Valve Spring Pocket Diameter 1.580" O.D Max Valve Spring Pocket Machining 1.680" O.D Deck Thickness .750" 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 Carb EO# 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 #1409 Fel-Pro #1409 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
Suggested Manifold AFR  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.