AFR 1680/1690 LS1 245/65 OR 73CC .650 LIFT ASSEMBLED YOUR CHOICE OF CHAMBER SIZE

CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS.  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 Click part # to add product to your cart 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 600Bore 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 4.900" Overall Valve Length 7211 8mm Bead Lock Exhaust Valve, 1.600" x 4.900" Overall Valve Length 7228 PAC Racing Spring 1.270" OD Hydraulic Roller Dual Valve Spring, 155 lbs. on seat, Max RPM 7000-7200 8019 7° Titanium Retainers 1.245" O.D x .885" I.D x .655" I.D 8512 7° Bead Lock Valve Keepers 9007* Viton Valve Seals .600" O.D x .495" I.D 6612 Hardened Valve Spring O.D Locator 1.380" O.D x .570" I.D 8042 Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" I.D x .375" Deep 9060 Ductile Iron Exhaust Valve Seats 1.650" O.D x 1.350" I.D x .375" Deep 9069 8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L 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. Recommended Components: Intake Port Gasket GM or FAST Exhaust Port Gasket GM #12558573 Head Gasket, Cometic 4.200 .040" 6845 Head Bolts (97-03), ARP 134-3609 6330 Head Studs (97-03), ARP 234-4110 6331 Head Bolts (04+), ARP 134-3610 6334 Head Studs (04+), ARP 234-4317 6335 Head Bolt Washers, Manley 6320 Suggested Manifold FAST 90mm, 92mm, or 102mm Spark Plug Starting Range NGK TR55 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 SHIPS IN THE LOWER 48 STATES FREE! CALL SHANON AT 507 445 3235 WITH ANY QUESTIONS. CONTACT US THE PRICE IS NEGOTIABLE BEST OFFER   Warning: May cause cancer and reproductive harm.