$$2,691.00Engine \ Cylinder Heads \ Chevy Small Block Aluminum Heads1690
AFR1690
AFR 1690 LSX Mongoose Street Aluminum Cylinder Heads, 245CC, 2.160/1.6 in. Valves, 73cc Comb
AFR's max effort cathedral port head for the LSX platform is recommended for race applications or radical 'Pro Street' builds with displacements up to 454 cubic inches, operating at or below 6800 RPM. Requires a minimum bore size of 4.000 in. to clear the supplied 2.165 in. intake valve. ...
Air Flow Research1690 LSX Mongoose Street Aluminum Cylinder Heads,

Air Flow Research

AFR 1690 LSX Mongoose Street Aluminum Cylinder Heads, 245CC, 2.160/1.6 in. Valves, 73cc Comb

Item #: AFR1690

Mfg Part #: 1690

Applies To Continental U.S. orders only

Specifications
Cylinder Head specifications
Cylinder Head Style
Assembled
Cylinder Head Material
Aluminum
Cylinder Head Finish
Natural
Combustion Chamber Volume (cc)
73cc
CNC-Machined Combustion Chamber
Yes
Intake Runner Volume (cc)
245cc
Exhaust Runner Volume (cc)
87cc
CNC-Machined Intake Runner
Yes
CNC-Machined Exhaust Runner
Yes
Combustion Chamber Style
Heart
Intake Port Shape
Cathedral
Intake Port Location
Standard
Exhaust Port Shape
Square
Exhaust Port Location
Standard
Spark Plug Type
14mm Spark Plug, .691 Reach, 5/8 Hex
Intake Valves Included
Yes
Intake Valve Diameter (in)
2.165 in.
Intake Valve Angle
15 Degree
Exhaust Valves Included
Yes
Exhaust Valve Diameter (in)
1.60 in.
Exhaust Valve Angle
15 Degree
Valve Type
Stainless Steel
Valve Springs Included
Yes
Valve Spring Type
Dual
Outside Diameter of Outer Spring (in)
1.290 in.
Damper Spring Included
Yes
Valve Spring Pressure Closed
155 lbs.
Retainers Included
Yes
Retainer Material
Titanium
Locks Included
Yes
Lock Style
7 degree
Valve Stem Seals Included
Yes
Valve Stem Seal Style
Positive Stop
Rocker Arm Studs Included
No
Rocker Arms Included
No
Rocker Arm Nuts Included
No
Guideplates Included
No
Valve Cover Mounting Style
Centerbolt
Accessory Bolt Holes Drilled
Yes
Valve Guides Included
Yes
Intake Valve Guide Material
Bronze
Exhaust Valve Guide Material
Bronze
Valve Seats Machined
Yes
Valve Seat Machine Style
5-angle
Valve Seat Material
Ductile iron
Steam Holes Drilled
No
Oiling Style
Through pushrod
Machined for O-Ring
No
Heat Crossover
No
Quantity
Sold as a pair.
Applications
Make
Chevrolet
Engine Family
Chevy small block Gen III/IV (LS-based engines)
Engine Size
6.2L/376-7.0L/427
Years
2006-2017
General
Brand
Air Flow Research
Item #
AFR1690
Mfg Part #
1690
Description

AFR's max effort cathedral port head for the LSX platform is recommended for race applications or radical "Pro Street" builds with displacements up to 454 cubic inches, operating at or below 6800 RPM. Requires a minimum bore size of 4.000 in. to clear the supplied 2.165 in. intake valve.

  • 2.160"/1.60" stainless valves
  • 87cc exhaust runners
  • 245cc Intake Runners
  • 65cc Combustion Chambers
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