1680 AFR 245cc LS1 15 degree Cylinder Head

Your Price: $2,691.00
Part Number: 4405
Availability: In Stock

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Our 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" to clear the supplied 2.165" intake valve.
245cc Aluminum LS1 Cylinder Heads
Part # Description Combustion Chamber
1680 Large Bore (4.000+) 65cc
1690 Large Bore (4.000+) 73cc

245cc Street Head Flow Chart
  .200 .300 .400 .500 .550 .600 .650
Int 164 233 290 332 347 356 360
Exh 131 185 227 247 249 257 267
Test conducted at 28" of water (pressure) on Superflow 600
Bore Size: 4.155", 3/4" radius plate exhaust, 1 3/4" curved pipe

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 4.900" Overall Valve Length
AFR #7211
8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length
AFR #7228
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 2.100" O.A.L
AFR #9051
*LSX bead locks and aftermarket bead locks are not interchangeable. GM made their bead lock radius and depth different. AFR locks are the same as GM LSX

Specifications & Features:
Material
A356 Aluminum
Intake Port Volume
245cc
Intake Port Dimension
3.315"H x 1.145"W x 11/32 top 13/32 bottom
Intake Port Location
Stock
Exhaust Port Volume
88cc
Exhaust Port Dimension
1.495" H x 1.730" W
Exhaust Port Location
Stock
Combustion Chamber Size
65cc or 73cc
Valve Cover Bolt Pattern
Center Bolt
Valve Angle
15°
Valve Spring Pocket Diameter
1.510" O.D
Max Valve Spring Pocket Machining
1.525" O.D
Deck Thickness
.750"
Minimum Bore Diameter
4.000"
Flat Mill - 65cc chamber
.006" per cc 58cc Maximum
Flat Mill - 73cc chamber
.006" per cc 65cc Maximum
Minimum Cross Sectional Area
2.680 sq. in.
Spark Plug Dimensions
14mm x .750" w/Gasket Seat


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