AFR's 210cc LSX heads are the preferred choice over re-worked factory heads. They feature 100% CNC ported intake, exhaust & chambers, A356 aluminum castings, Titanium retainers and high quality components throughout. Recommended for street, towing, or street/strip engines with displacements up to 383 cubic inches, operating up to 6300 RPM. Requires minimum 3.900 bore size for intake valve clearance. Legal for 2005 and older emissions controlled vehicles under CARB EO #D-250-4. Component upgrade and machining options are available to customize AFR Heads to your specific build.
The Small Port, High Velocity Torque Monster!
Designed specifically for 3.900 Bore LSX engines.
For the ultimate high performance street LS1/LS2/LS6 aluminum
cylinder head AFR’s all new 210cc emission legal heads (E/O #
D250-4) are your only choice. Specifically designed for 1997 to
present Gen-3 Chevy Corvettes, Camaros, and trucks using a 3.900
Bore. AFR’s LSX cylinder head offers unmatched flow performance (302
CFM at .600lift) and features 2.020" intake and 1.600" exhaust
valves with AFR’s iron ductile interlocking valve seats. With only
210cc port volume (nearly identical to a stock LS1 head) this is an
incredible 70 CFM increase over stock casting, creating unbelievable
port velocity and performance. The 210cc cylinder head is ideal for
naturally aspirated 346 CI to 396 CI engines. It comes standard with
66cc combustion chambers. AFR’s LSX is a direct bolt on, no special
parts required. Structural features like Air Flow Research’s
trademark 3/4” thick head deck, a must for blown and nitrous
applications, reinforced rocker stud bosses, and thick wall runners
provide unparalleled durability. An exclusive new modern combustion
chamber design with double quench pad area helps the LSX generate
huge low and mid lift airflow numbers. If you need a snake charmer
for that pesky neighborhood “Cobra Mustang” look no further!
Note: Hydraulic roller cams in "LS" Gen III engines typically
experience valve float at 6600-6800 RPM's. If you are using
aftermarket rocker arms valve float will become prominent and AFR
highly recommends upgrading to the AFR part #8019 spring. If you
plan on running over .600 gross valve lift and/or 6600 RPM, AFR
suggests you upgrade your springs to AFR part #8019. The upgraded
springs have higher seat and open pressures (155/410+) to better
reduce the risk of valve float in more aggressive applications.
Note: 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.
color="#ffffff" size="4">Basic Package
Components |
color="#ffffff" size="4">Part # |
100%
CNC
Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
Competition 3-angle Radiused Valve
Job |
|
8mm Bead Lock Intake
Valve, 2.020” x 4.900" Overall Valve Length
|
AFR #7207 |
8mm
Bead Lock Exhaust Valve, 1.600” x 4.900" Overall Valve
Length |
AFR
#7228 |
PAC
Racing Spring 1.290" OD Hydraulic Roller Dual Valve
Spring,
140 lbs on seat, .600" maximum lift, Max RPM 6300-6500
|
AFR #8017 |
*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. |
*Notes
|
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 2.131" O.D x 1.680" I.D x .375" Deep |
AFR #9059 |
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 |
color="#ffffff" size="4">Specifications,
Features, and Optional
Supporting Components |
Head
Torque |
11mm ARP 70ft. lbs. w/ Moly
|
Head Torque |
8mm 23ft. lbs. w/
Moly |
Exhaust
Port
Gasket |
style="float:right;">GM#12558573 |
Intake Port Gasket
|
GM or FAST |
Head
Gasket, Cometic 3.930 .040" |
AFR
#6846 |
Head Bolts (97-03) |
AFR #6330 |
Head
Studs (97-03) |
AFR
#6331 |
Head Bolts (04+) |
AFR #6334
|
Suggested
Manifold |
FAST 90mm,
92mm, or 102mm
|
Intake Port
Volume |
210cc |
Exhaust
Port
Volume |
84cc
|
Combustion
Chambers |
66cc
|
Spring
Pocket |
1.510"
O.D to1.525, no deeper
|
Valve Spacing |
Stock
|
Head
Bolt Washers, Manley |
AFR
#6320
|
Valve Angle |
15° |
Flat
Mill
(Milling options available) |
style="float:right;">.006" per cc 58cc Maximum |
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.
