AFR® 1031 - Eliminator 23° LT1 Street Cylinder Heads

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$2,389.82
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Product Details

Eliminator 23° LT1 Street Cylinder Heads by AFR®. Known for its innovative design and high quality, this product will increase the horsepower of your vehicle and improve your driving experience. It is made utilizing the latest in modern technology and advanced processes to meet the highest industry standards and all customer demands.

Notes

  • Not compatible with Self-Aligning Rocker Arms, designed for use with Generation II LT4 intake manifolds only
  • Do not port match your intake manifold to Fel-Pro gasket as it does not precisely fit AFR heads

Includes

  • 8mm Bead Lock Intake Valve, 2.050" x 4.900" Overall Valve Length
  • 8mm Bead Lock Exhaust Valve, 1.600" x 4.950" Overall Valve Length
  • PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, 0.600" maximum lift, Max RPM 6300-6500(upgrades available)
  • 7° Titanium Retainer 1.245 OD x 0.885 ID x 0.655 ID
  • 7° Bead Lock Valve Keepers
  • ARP 3/8" Rocker Studs
  • Adjustable 5/16" Guide Plates
  • Viton™ Valve Seals 0.600" O.D x 0.495" I.D
  • Hardened Valve Spring O.D Locator 1.380" O.D x 0.570" I.D
  • Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x 0.375" Deep
  • Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x 0.305" Deep
  • 8 mm Bronze Valve Guides 0.502" O.D x 2.100" O.A.L: AFR #9051

Features

  • 100% CNC Ported Combustion Chambers
  • 100% CNC Ported Exhaust Ports
  • 100% CNC Ported Intake Ports
  • Competition 5-angle Valve Job
  • Designed to meet the needs of racers or street enthusiasts
  • Made using the latest in modern technology and advanced processes
  • Strict quality control and thorough testing

Recommended Components:

  • Intake Gasket: GM #12524653 LT1 or Fel-Pro #1284
  • Exhaust Port Gasket, Fel-Pro #1404: AFR #6834
  • Head Gasket, 350cid Fel-Pro #1003: AFR #6803
  • 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
  • AFR Stud Girdle: AFR #6200
  • Suggested Manifold: GM LT1 or LT4
  • Spark Plug Starting Range: Autolite 3924

AFR Small Block Chevy

  • We strongly recommend using 7/16" rocker studs with todays fast cam rates and RPM capabilities as 3/8" Rocker Studs can occasionally break.
  • Heads with 1.625" O.D springs will require some springs to be removed for access to some head bolts when installing the heads.
  • Heads are designed for 5/16" pushrods, Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120" thick-wall pushrods.
  • AFR 227/235cc Heads: Due to the 60/40 stud and valve locations, shaft mount rockers are highly recommended, however if you?re ONLY Drag Racing you can run a .050" offset intake stud mount rocker with the AFR supplied guide plate (exhaust will use a standard rocker). Please note that with the .050" offset rocker arms the roller tip of the stud mount rocker will not be perfectly centered and will not sit squarely on the valve causing increased side loading and wear. This option is not recommended for race/endurance applications and/or street engines that see a lot of miles.
  • AFR LT-1 / LT-4 / Vortec Heads - Your factory accessory bolts and center bolt valve covers need to be shortened 3/16? or they will bottom out.
  • Modeled after GM L-98 Aluminum Head

General Recommendations for AFR Cylinder Heads:

  • Bar Codes - Please keep the bar code & paperwork shipped with your head, these contain all the specs for your heads when calling AFR.
  • Pushrods - Different length pushrods might be required, always check pushrod length. Check pushrod clearance with heads placed on the block before final assembly. Larger pushrods will not fit without clearancing and is not recommended since some areas are very thin. AFR recommends the use of .120" thick-wall pushrods.
  • Mills - Flat or angle mills could affect flow numbers and might require a thicker intake gasket.
  • Stud Girdles - Due to many available factory OEM and aftermarket style/variations your existing stud girdle may not fit (AFR heads require AFR Stud Girdles)
  • Boosted/Nitrous Applications - We strongly recommend considering Inconel exhaust valves and AFR's optional heavy duty intake valve for power adder applications. Since boosted or nitrous oxide applications accelerate RPM quickly, additional spring pressure is required. We strongly recommend upgrading your valve springs or increasing your valve spring pressures since boost pressure on the valve reduces spring tension. For example, 15lbs boost on a 2.125 OD valve reduces the springs closed seat pressure by approximately 40-45lbs.
  • All MARINE Applications - We strongly recommend Inconel exhaust valves & also offer a hard anodized coating to slow the effects of corrosion. Please see note on guide clearance below.
  • Valve Guide Clearance - Your AFR Heads come with proper guide clearance (.0012"-.0016") for most applications. Boosted/Nitrous or marine applications might require additional clearance and it is the customer's responsibility to verify proper clearance in these applications.
  • Valve Springs - Forced induction, nitrous oxide and cams with aggressive ramp rates may require additional spring pressure. We offer optional valve springs for these types of applications. AFR also recommends the use of billet cam cores which tolerate higher spring loads. Please don't hesitate to contact us directly if you question which spring is correct for your application.
  • AFR Titanium Valves - Might require lash caps and different length pushrods. Titanium valves are coated, do not grind valves because it removes the protective coating.
  • Piston to Valve - AFR assumes no responsibility for damage if the end user builds an engine without properly verifying he has enough piston to valve clearance (depth and radial clearance both checked). We recommend a minimum depth of .080" on the intake valve and .100" on the exhaust with a radial clearance of .020" minimum around the perimeter of each valve. Clay is recommended to visually verify both depth as well as radial clearance. Just checking depth is not enough, the position of the valve pocket must also be addressed. It is the customers responsibility to verify proper piston to valve clearance.
  • CNC Porting - Occasionally a 100% CNC ported head might have a very small area left "as cast", this in no way affects performance.
  • Shaft Mount Rockers - Shaft mount rockers might require additional clearance for proper pushrod fitment. Do not clearance the push rod area as the wall is .060" thick.
  • Spring Installation - To ease installation with 1.550" O.D or larger springs, 12 pt head bolt or studs are recommended for extra clearance. Beveled or ground washers might be needed (ARP #200-8504 comes with smaller O.D and doesn't need to be ground)
  • Runner Volume - Intake runner volumes can vary 2-3cc from advertised specs. The reason for this is that different combustion chamber volumes require different intake runner lengths for proper alignment with the intake manifold.
  • Rocker Arms - Use full roller rocker arms, roller tip rockers with stock style bodies are NOT recommended.
.

For over 45 years, Air Flow Research (AFR) has been defining technological leadership in cylinder head manufacturing and flow dynamics. This complete commitment to performance has enabled AFR® cylinder heads to find themselves on the fastest race cars and the most powerful street machines in the country. Air Flow Research’s design, engineering, and manufacturing technology never rests. As a leader today, AFR is investing in the horsepower of tomorrow with new manufacturing technology, complex dyno testing, and proprietary flow testing methods. And to assure a long-standing tradition to performance, AFR is bringing up a new generation of racers and engineers to meet the demands of tomorrow’s engine builders.

Brand:
Part Number:
1031

Vehicle Fitment

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AFR® 1031 - Eliminator 23° LT1 Street Cylinder Heads
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