Free shipping within the USA* on all orders $99 & up!!

AFR LS3 12° Mongoose 210cc Cylinder Heads

$3,599.99 $2,719.99

Brand AFR
SKU: 1840

AFR’s, MONGOOSE, LS1 Cathedral Port cylinder heads are 100% 5-AXIS CNC ported and made with A356 aluminum. All heads come with high quality components, such as titanium retainers and Pac Racing Springs. Available in runner volumes from 210cc, 215cc, 230cc and 245cc. Component upgrades and different machining options are available to customize your AFR heads for your specific build. Minimum bore sizing is 3.900” to accommodate intake valve clearance.

SOLD AS A PAIR

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. Emmisons legal for 2008 to 2015 vehicles under CARB #D-250-5. 

260cc Aluminum LS3 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

Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", 3/4" radius plate exhaust, 1 3/4" curved pipe

Basic Package Components
100% 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