AFR - Airflow Research 260cc LS3 Mongoose Street Aluminum Cylinder Heads LS Chevy Block
033-1846
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LS 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
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