1840 LS3 MONGOOSE - 12° CYLINDER HEAD 260CC LS3 CYLINDER HEAD

Your Price: $2,638.00
Part Number: 4406
Availability: In Stock

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AFR’s 260cc LS3 “Mongoose” heads feature 100% CNC ported intake, exhaust and chambers using our advanced engineering and flow techniques to produce the ultimate Rectangle Port head available today. Featuring A356 aluminum castings, titanium retainers and the highest quality components, throughout. They’re designed for 4.000 or larger bore applications up to 454 CI, operating up to 7000 RPM. Emission legal for 2008 to 2015 vehicles under CARB #D-250-5. 

260cc Aluminum LS1 Cylinder Heads
Part # Description Combustion Chamber
1840 CNC Ported w/parts - 6 Bolt 69cc
1845 CNC Ported w/parts - 4 Bolt 69cc
260cc Street Head Flow Chart
  .200 .300 .400 .500 .600 .650 .700
Int  159         234         293          336 366          377          384
Exh  112         158         207          235 248          251          255

Basic Package Components100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job
8mm Bead Lock Intake Valve, 2.165" x 5.195" Overall Valve Length
AFR #7214
8mm Bead Lock Exhaust Valve, 1.600" x 5.200" Overall Valve Length
AFR #7212
PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, Max RPM 7000-7200
AFR #8019
7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D
AFR #8512
7° Bead Lock Valve Keepers
AFR #9007
Viton Valve Seals .600" O.D x .495" I.D
AFR #6612
Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D
AFR #8042
Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep
AFR #9060
Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep
AFR #9069
8 mm Bronze Valve Guides .502" O.D x 2.550" O.A.L
AFR #9053
Rocker Rail Stand
AFR #6040

Specifications & Features:
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
.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/ Tapered or Gasket Seat
Carb EO#
D-250-5

“WARNING: This product contains a chemical known to the State of California to cause cancer and/or birth defects 
or other reproductive harm. – www.P65Warnings.ca.gov”

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