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AFR - Airflow Research 1031NP

195cc LT1/LT4 Eliminator Street Aluminum Cylinder Heads SB-Chevy

AFR - Airflow Research 1031NP
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033-1031NP

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AFR - Airflow Research 1031NP 195cc LT1/LT4 Eliminator Street Aluminum Cylinder Heads SB-Chevy $1,683.92
195cc LT1/LT4 Eliminator Street Aluminum Cylinder Heads
  • SB-Chevy
  • Street CNC Porting
  • 58cc Combustion Chambers
  • Angle Spark Plug
  • Bare Head Only
  • CARB OE #D-250-2
  • Sold in Pairs, 2/pkg.

  • AFR - Airflow Research 1031NP Details

    Street CNC Porting LT1/LT4 Eliminator Cylinder Heads

  • 2.050'' Intake Valve

    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 195cc LT1/LT4 Eliminator 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 - 2.050'' (Valve not included)
    Exhaust Valve Size - 1.600'' (Valve not included)
    Intake Valve Seats
    Exhaust Valve Seats
    Bronze Valve Guides
    Small Block Chevy 195cc LT1/LT4 Eliminator Street Head Specifications
    Head Torque w/Moly Lube 65-70 Ft. Lbs.
    Rocker Stud Torque 55 Ft. Lbs.
    Intake Port Gasket AFR 375-1284 - DO NOT PORT MATCH Intake Manifold to Fel-Pro Gasket.
    Exhaust Port Gasket Fel Pro 375-1404
    Head Gasket 350ci Fel Pro 375-1074
    Head Bolts & Studs Standard ARP
    Head Bolt Washers Manley Standard
    Stud Girdle Standard GM L98
    Suggested Manifold GM LT4
    Spark Plug Starting Range AC FR3LS or 41629
    Combustion Chambers 58cc
    Spring Pocket can be cut to 1.625, no deeper.
    Valve Spacing Standard GM L98
    Rocker Arms Standard GM L98
    Valve Angle 23°
    Angle Mill .008'' per cc
    Flat Mill .006'' per cc

  • Specifications:

    Manufacturer's Part Number:
    1031NP

    The Ultimate Bolt-on
    Emissions Legal Street Weapon!

    The AFR Emissions Legal (CARB EO #D-250-2 for engines up to 1994), 195cc intake port LT4 small block Chevy aluminum cylinder heads are available in an LT4 angle plug version. These heads feature a 58cc combustion chamber (can be special ordered 55 to 65cc) with a 64cc exhaust port and a 3/4'' thick head deck (ideal for nitrous or blower applications). Standard valves are lightweight 8mm diameter stem, 2.020'' intake and 1.600'' exhaust valves with AFR's hardened ductile iron interlocking valve seats. The exceptional flow characteristics, ideal operating range of 2500 rpm to 6500 rpm (higher rpm ranges possible depending on combination of parts), 23° valve angle, and standard valve spacing make this the perfect street head for 350-383 ci engines. Designed specifically for 1996 Corvettes or LT4 manifold users. No special parts are required. Dual valve cover bolt pattern is standard. Exhaust port and bolt pattern are raised .100'' (3/32'') over GM L98 cylinder heads, this rarely affects header or chassis fitment. Made in USA.
    Installation Note: Hydraulic roller cams typically experience valve float at 6200-6400 rpm because of their fast ramp rates. AFR suggest you upgrade your springs to AFR part number 033-8605, 1.270'' O.D. with higher spring pressures and use our Patented ''Hydra Rev Kit'' to reduce chances of valve float associated with rpm 6200 or higher.

    195cc LT1 Eliminator Street Cylinder Head Features:
  • 100% CNC Ported Combustion Chambers
  • 100% CNC Ported Exhaust Ports
  • 100% CNC Ported Intake Ports
  • Competition 5-angle Valve Job
  • 195cc Intake Ports
  • 58cc Combustion Chamber (Can be special ordered 55 to 65cc)
  • 64cc Exhaust Ports
  • Bead Lock Intake Valve, 2.050'' x 4.903'' Overall Valve Length (Street Port Head)
  • Bead Lock Intake Valve, 2.080'' x 4.903'' Overall Valve Length (Competition Package Street Port Head)
  • Bead Lock Exhaust Valve, 1.600'' x 4.955'' Overall Valve Length
  • PAC Racing Valve Spring: 1.290'' OD Hydraulic Roller Dual Valve Spring, 135 lbs on seat, .600'' maximum lift (Street Port Head)
  • PAC Racing Valve Spring: 1.270'' OD Hydraulic Roller Valve Spring woth Dampener, 155 lbs on seat, .650'' maximum lift (Competiton Package Street Port Head)
  • 7° Titanium Retainers
  • 7° Bead Lock Valve Keepers
  • 3/8'' Rocker Studs
  • Adjustable 5/16'' Guide Plates (if using non-self aligning rockers)
  • Viton Valve Seals
  • Hardened Spring Cup
  • Intake Valve Seats
  • Exhaust Valve Seats
  • Bronze Valve Guides
  • Standard Exhaust Bolt Pattern, Accepts Factory and Aftermarket Headers

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