Black Friday
800.345.4545
Call Our Support Line
24 Hours / 7 Days a Week!  
FREE SHIPPING!
Same Day Shipping Before 11 PM ET
0
My Cart
0
$0.00
Shop By Vehicle
Shop By
Category
Close Menu
Shop By Vehicle
Top Categories
All Categories

All Categories


Free Catalog
E-Mail Signup
My Account
Track Order
Gift Certificates
Rebates
Help

AFR - Airflow Research 1138NP

245cc Eliminator Race Aluminum Cylinder Heads Small Block Chevy

AFR - Airflow Research 1138NP

033-1138NP

jegs shipping
FREE Shipping
Estimated ship date 12/20/17 if Ordered Today
Easy Returns
Easy Returns
Lowest Price Guarantee
Lowest Price Guarantee
AFR - Airflow Research 1138NP 245cc Eliminator Race Aluminum Cylinder Heads Small Block Chevy $2,299.87
245cc Eliminator Race Aluminum Cylinder Heads
  • Small Block Chevy
  • Competition Package CNC Porting
  • 80cc Combustion Chambers
  • Standard Exhaust Port Configuration
  • Angle Spark Plug
  • Bare Head Only
  • Sold in Pairs, 2/pkg.

  • AFR - Airflow Research 1138NP Details

    Competition Package CNC Porting Eliminator Heads

  • Standard Exhaust Port Configuration

    This is an unassembled bare cylinder head with valve guides and valve seats installed only. Does not include any parts such as valves, springs, spring components, studs or guideplates.

    Small Block Chevy 245cc Eliminator Race Basic Package Components
    100% CNC Ported Combustion Chambers
    100% CNC Ported Exhaust Ports
    100% CNC Ported Intake Ports
    Competition 5-Angle Valve Job
    Intake Valve Size - 2.125'' (Valve not included)
    Exhaust Valve Size - 1.600'' (Valve not included)
    Intake Valve Seats
    Exhaust Valve Seats
    Bronze Valve Guides
    Small Block Chevy 245cc Eliminator Race Head Specifications
    Head Torque w/Moly Lube 65-70 Ft. Lbs.
    Rocker Stud Torque 55 Ft. Lbs.
    Intake Port Gasket, 1.310'' x 2.180'' w/ 3/8'' radius Fel-Pro 375-1206 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
    Exhaust Port Gasket Fel Pro 375-1405
    Head Gasket 350ci Fel Pro 375-1004
    400ci Fel Pro 375-1014
    Head Bolts & Studs Standard ARP
    Head Bolt Washers Manley Standard
    Suggested Manifold AFR p/n 033-4801, AFR p/n 033-4802 or Edelbrock Vic Jr p/n 350-2975 or Super Victor p/n 350-2925
    Spark Plug Starting Range Autolite 3910
    Combustion Chambers 80cc
    Intake Port 245cc
    Exhaust Port 80cc+
    Spring Pocket can be cut to 1.680, no deeper.
    Valve Spacing 60/40
    Shaft Mount Rocker Arms T&D .450'' Offset w/.180'' Offset Lifter - T&D .550'' Offset w/Standard Lifter
    Valve Angle 23°
    Angle Mill .008'' per cc
    Flat Mill .006'' per cc
    NOTE: Flat and Angle mills might require a .120'' thick head gasket.

  • Specifications:

    Accessory Bolt Holes Drilled
    Yes
    CNC-Machined Combustion Chamber
    Yes
    CNC-Machined Exhaust Runner
    Yes
    CNC-Machined Intake Runner
    Yes
    Combustion Chamber Style
    Heart
    Combustion Chamber Volume (cc)
    80
    Cylinder Head Finish
    Natural
    Cylinder Head Material
    Aluminum
    Cylinder Head Style
    Bare
    Damper Spring Included
    No
    Exhaust Port Location
    Raised
    Exhaust Port Shape
    Square
    Exhaust Runner Volume (cc)
    80
    Exhaust Valve Angle
    23
    Exhaust Valve Diameter (in.)
    1.6
    Exhaust Valves Included
    No
    Guideplates Included
    Yes
    Heat Crossover
    No
    Intake Port Location
    Standard
    Intake Port Shape
    Rectangular
    Intake Runner Volume (cc)
    245
    Intake Valve Angle
    23
    Intake Valve Diameter (in.)
    2.125
    Intake Valves Included
    No
    Locks Included
    No
    Machined for O-Ring
    No
    Oiling Style
    Through pushrod
    Quantity
    Sold as a pair
    Retainers Included
    No
    Rocker Arm Nuts Included
    No
    Rocker Arm Studs Included
    No
    Rocker Arms Included
    No
    Spark Plug Style
    Angled
    Steam Holes Drilled
    No
    Valve Cover Mounting Style
    Perimeter bolt
    Valve Guide Material
    Bronze
    Valve Guides Included
    Yes
    Valve Seat Machine Style
    5-angle
    Valve Seat Material
    Ductile iron
    Valve Seats Machined
    Yes
    Valve Springs Included
    No
    Valve Stem Seals Included
    No
    Manufacturer's Part Number:
    1138NP

    AFR's Largest and Most Powerful
    SB-Chevy 60/40 Head

    AFR is proud to introduce their new 245cc NPP (no pushrod pinch) cylinder head that's best suited for max effort applications, but larger displacement 427+ pump gas engines could consider this head as well. This exciting product represents AFR's best flowing 23° Small Block Chevy 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° short block as easily as the 227cc or 235cc small block head. And, in fact, it shares indentical valve centerlines and rocker stud locations to both of those heads. However, unlike the 227cc and 235cc heads, this product will not accept stud mount style rockers. A shaft mount rocker system with a .180'' offset intake lifter is required. Larger diameter 3/8'' pushrods fit without additional clearancing. This is primarily due to the fact that they enlarged and widened the pushrod pinch removing that check point in the entrance of the intake allowing them 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 Valves. The exhaust port and bolt pattern are raised .250'' (1/4'') over GM L98 head, this rarely affects header or chassis fitment. If you are unsure if this is the right AFR head for you, we encourage you to contact us directly to discuss your combination. These 245cc aluminum cyilnder heads are standard port configuration only. Spread port exhaust configuration not available. .

    245cc Eliminator Race Cylinder Head Features:
  • 100% CNC Ported Combustion Chambers
  • 100% CNC Ported Exhaust Ports
  • 100% CNC Ported Intake Ports
  • Competition 5-angle Valve Job
  • 245cc Intake Ports
  • 80cc+ Exhaust Ports
  • Bead Lock Intake Valve, 2.125'' x 5.006'' Overall Valve Length
  • Bead Lock Exhaust Valve, 1.600'' x 5.024'' Overall Valve Length
  • PAC Racing Valve Spring: 1.550'' OD Solid Roller Dual Valve Spring, 250 lbs on seat, .800'' maximum lift, Max RPM 8300-8500
  • 10° Retainers
  • 10° Bead Lock Valve Keepers
  • Viton Valve Seals
  • Hardened Spring Cup
  • Intake Valve Seats
  • Exhaust Valve Seats
  • Bronze Valve Guides
  • Standard Exhaust Bolt Pattern

  • Before you leave us... Receive a free catalog or join our email list

    Sign up to receive our catalog or subscribe to our email list now to see our exclusive email only specials, new products, and offers!

    Request CatalogJoin Email List