Afr 245cc Lsx Cylinder Heads, 64cc Chambers, No Parts

AFR's 245cc LSX "Competition" ported heads feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, with no parts. Recommended for race applications or radical "Pro Street" style builds with displacements up to 454 cubic inches, operating up to 6800 RPM. Requires minimum 4.000 bore size for intake valve clearance. Component upgrade and machining options are available to customize AFR Heads to your specific build.
THE BEST Cathedral Port Head Available with 64cc Chambers!
A tremendous amount of time and energy was invested to bring you our 245cc LS1/LS2/LS6 Gen III head that represents the pinnacle in cathedral design bolt on performance. With over 355 CFM's available it has intake flow numbers approaching GM's famed (and much larger) LS7 head with much stronger exhaust flow in comparison. This head is our take no prisoners LSX cathedral shaped offering and its focus is large displacement combinations (415 - 454 CID) with a minimum bore size of 4.000. It requires a head gasket bore of 4.200 or larger and comes standard equipped with lightweight 2.160 intake valves / 1.600 exhaust. Another unique feature of this head is that it is “solid roller friendly” having been designed and machined to accept larger .375 pushrods without additional clearancing (in most applications) and comes direct from the factory with 1.570 spring pockets (Note: Under no condition can these pockets be machined deeper). With an aggressive set-up this head is capable of producing power in the 700 HP range while still providing gobs of low and midrange torque. It is still a factory direct bolt on with standard length valves, stock valve train geometry, and everything in their respective OEM locations. It of course comes standard equipment with AFR's trademark 3/4” head deck and the same rugged castings found in the rest of the AFR LSX line up. Make sure you’re packing lots of displacement to fully realize the benefits this head can offer you and hang on when its time to go WOT!

Basic Package Components Part # 100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 5-angle Valve Job  
Specifications, Features, and Optional Supporting Components Head Torque 11mm ARP 70ft. lbs. w/ Moly Head Torque 8mm 23ft. lbs. w/ Moly Exhaust Port Gasket GM #12558573 Head Gasket, Cometic 4.200 .040" AFR #6845 Head Studs (04+), ARP 234-4317 AFR #6335 Head Bolts (97-03), ARP 134-3609 AFR #6330 Head Studs (97-03), ARP 234-4110 AFR #6331 Head Bolts (04+), ARP 134-3610 AFR #6334 Suggested Manifold FAST 90mm, 92mm, or 102mm Intake Port Volume 245cc Exhaust Port Volume 88cc Combustion Chambers 65cc or 73cc Spring Pocket 1.150 O.D /Can be cut to 1.525, no deeper Head Bolt Washers, Manley AFR #6320 Intake Port Dimension 3.315"H x 1.145"W x 11/32 top 13/32 bottom Valve Angle 15° Flat Mill (Milling options available) .006" per cc Important: Do not port match you intake manifold to any Fel-Pro gasket as it does not precisely match AFR heads.
Note: Milling head deck will affect flow numbers.