AFR - Airflow Research 260cc LS3 Mongoose Street Aluminum Cylinder Heads LSX Chevy Block
033-1841
Product Q&A
View Now
LSX Blocks
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.
| LS Chevy 260cc LS3 Mongoose 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, 2.165" x 5.195" O.A.L. (Valve not included) | |
| Exhaust Valve Size, 1.600" x 5.200" O.A.L. (Valve not included) | |
| Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep | |
| Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep | |
| 8 mm Bronze Valve Guides .502" O.D x 2.550" O.A.L. | |
| Rocker Rail Stand | |
| LS Chevy 260cc LS3 Mongoose Street Head Specifications | |
| Material | A356 Aluminum |
| Intake Port Volume | 260cc |
| Intake Port Dimension | 2.610"H x 1.300"W x 7/16° Radius |
| Intake Port Location | Stock |
| Exhaust Port Volume | 95cc |
| Exhaust Port Dimension | 1.540" H x 1.760" W |
| Exhaust Port Location | Stock |
| Combustion Chamber Size | 69cc |
| Valve Cover Bolt Pattern | Center Bolt |
| Valve Angle | 12° |
| Valve Spring Pocket Diameter | 1.490" O.D. |
| Max Valve Spring Pocket Machining | 1.510" O.D. |
| Deck Thickness | 0.750" |
| Minimum Bore Diameter | 4.000" |
| Flat Mill - 65cc chamber | .006" per cc 62cc Maximum |
| Minimum Cross Sectional Area | 2.875 sq. in. |
| Spark Plug Dimensions | 14mm x .750" w/Gasket Seat |
| Carb EO# | D-250-5 |
| Intake Port Gasket | Factory GM or Aftermarket |
| Exhaust Port Gasket | GM #12558573 |
| Head Gasket | Cometic 4.160 Bore Size |
| Head Bolts (04+) | ARP 134-3610 |
| Head Studs (04+) | ARP 234-4317 |
| Head Bolt Washers | Manley |
| Suggested Manifold | FAST 92mm or 102mm |
| Spark Plug Starting Range | NGK TR55 |
| Rocker Arms | Use full roller rocker arms, roller tip rockers with stock style bodies are NOT recommended. |
| 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. |
| 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) |
Specifications:
Motor Vehicles
WARNING: Motor vehicles contain fuel, oils and fluids, battery posts, terminals and related accessories which contain lead and lead compounds and other chemicals known to the State of California to cause cancer, birth defects and other reproductive harm. These chemicals are found in vehicles, vehicle parts and accessories, both new and as replacements. When being serviced, these vehicles generate used oil, waste fluids, grease, fumes and particulates, all known to the State of California to cause cancer, birth defects, and reproductive harm.
Tools:
WARNING: Some dust created by power sanding, sawing, grinding, drilling, and other construction activities contains chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Some examples of these chemicals are: lead from lead-based paints, crystalline silica from bricks and cement and other masonry products, and arsenic and chromium from chemically treated lumber. Your risk from exposure to these chemicals varies, depending on how often you do this type of work. To reduce your exposure, work in a well-ventilated area and with approved safety equipment, such as dust masks that are specially designed to filter out microscopic particles.
Electrical Cords
WARNING: The wires of these products contain chemicals known to the State of California to cause cancer and birth defects or other reproductive harm. Wash hands after handling.