AFR - Airflow Research 1132NP - AFR SB-Chevy Competition Aluminum Cylinder Heads
AFR - Airflow Research #033-1132NPSBC 235cc Competition Heads standard exhaust 68cc chambers |
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AFR - Airflow Research 1132NP - AFR SB-Chevy Competition Aluminum Cylinder Heads Details
Chevy Eliminator Heads Competition CNC Ported - 235cc Intake Ports
With the price of big displacement SBC engines fractions of what they were years ago, the allure to go BIG is stronger than ever. To help quench the thirst of that large displacement monster AFR is proud to offer our largest direct bolt on 23' Chevy head yet. AT 235cc's, anything under 400 inches can look the other way. It has the same geometry of our 227 head and will accept all the same rocker arms, stud girdles, etc. AFR offset stud girdles are the only special parts required. Some applications require shaft mount rockers or .050 offset intake rocker arm for durability and reliability of valve train components. Standard rocker arms can be used but the intake rocker arm will be at a slight angle and the roller tip will not be perfectly centered on the valve. It will feature a larger 2.125 diameter intake valve. Exhaust valve diameter stays the same with a little more flow from its larger runner volume. The big news is our all new intake port design which pushes this standard location intake port over 335 CFM's! That's 18° territory and this head should be able to generate power figures that rival those heads (725+ HP). This head is not for every large displacement combination so if you're unsure whether this is the right AFR head for you, we always encourage you to contact us directly.
Basic Package Components Part #
Specifications, Features:
Bead Lock Intake Valve, 2.125" x .100" long
Bead Lock Exhaust Valve, 1.600" x .100" long
1.550" OD Roller Dual Valve Spring
225 lbs. on seat, .710" maximum lift
10º 4140 Chrome Moly Retainers
10º Bead Locks Valve Keepers
7/16" Rocker Studs
5/16" Guide Plates
Viton Valve Seals
Hardened Spring Seat
Intake Valve Seats
Exhaust Valve Seats
Bronze Valve Guides
Pairs of Cylinder Heads Complete With
Head Torque 65-70 ft. lbs.
Rocker Stud Torque 55-60 ft. lbs
Intake Gasket 1.280x2.090 w/ 3/8" radius, Fel-Pro #1206
Exhaust Port Gasket, Fel-Pro #1405
Head Gasket, Fel-Pro #1004
Head Bolts and Studs, Standard ARP
Head Bolts and Studs, Standard ARP
Head Bolt Washers, Manley
Stud Girdle AFR Offset
Suggested Manifold, Edelbrock Victor Jr, Super Victor, or Brodix HV1000;
Spark Plug Starting Range Autolite 39100
Valve Spacing 60/40
Valve Angle 23°
Angle Mill .008" per cc
Flat Mill .006" per cc
AFR Competition Package Cylinder heads provide the next step up in power production for just a few extra dollars. In the Competition Heads intake ports, exhaust ports and cylinder heads are all precisely 100% CNC ported for flow characteristics that can give the power you need to win. Airflow Research Completion Package Heads come complete and ready to run with AFR's proven components for maximum power and reliability.
All Accessory Holes are Predrilled & Tapped!
AFR 195cc SBC Competition Cylinder Head
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The AFR Emissions Legal (versions from 1969-94 with heat riser, CARB EO #D-250-2). These heads feature a 74cc combustion chamber with a 64cc exhaust port and a 3/4” thick head deck (ideal for nitrous or blower applications). The exceptional flow characteristics, ideal operating range of 2000 rpm to 6500 rpm, 23º valve angle, and standard valve spacing make this the perfect street head for 350 cid to 400 cid engines from 1955-86. Available for 1987 to present engines with center bolt valve covers and 2 center intake bolts at 72º angle. No special parts are required.
AFR 210cc SBC Competition Cylinder Head
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These reasonably priced AFR 210cc intake port small block Chevy angle plug cylinder heads feature 100% CNC ported intakes, and come with 100% CNC ported 66cc combustion chambers and 80cc exhaust ports with a 3/4” thick head deck (ideal for nitrous or blower applications). Standard valves are 2.080 intake and 1.600 exhaust with AFR’s hardened ductile iron interlocking valve seats. The exceptional flow characteristics, 23º valve angle, and standard valve spacing make this the perfect head for 350 to 400 cid engines in bracket drag cars, sportsman oval trackers, and highly modified street class cars operating between 3000 and 7500 rpm (higher rpm ranges possible depending on combination of parts). No special parts are required.
AFR 227cc SBC Competition Cylinder Head
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High flowing AFR 227cc intake port small block Chevy angle plug cylinder heads feature 100% CNC ported intakes, with 100% CNC ported 66cc combustion chambers and 80cc exhaust ports with a 3/4” thick head deck (ideal for nitrous or blower applications). Standard valves are 2.100 intake and 1.600 exhaust with AFR’s hardened ductile iron interlocking valve seats. The 227 has 60/40 valve spacing and piston valve pockets should be checked. The exceptional flow characteristics and 23º valve angle make this the perfect head for 350 to 434 cid engines in drag cars, sprint cars, and late model oval trackers operating from 4500 rpm and up. AFR offset stud girdles are the only special parts required. Some applications require shaft mount rockers for durability and reliability of valve train components. Not recommended for street use, unless shaft mount rocker is used.
AFR 245cc SBC Competition Cylinder Head
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245CC NPP (no pushrod pinch) Heads; best suited for max effort applications, but larger displacement 427+ pump gas engines could consider this head as well. This exciting product represents our 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 our 227 or 235 SBC product and in fact shares indentical valve centerlines and rocker stud locations to both of those heads. However, unlike the 227 and 235 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 fact we enlarged and widened the pushrod pinch removing that checkpoint in the entrance of the intake allowing us 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.
