225cc LSX Mongoose Strip Aluminum Cylinder Heads
The Ultimate Bolt-On Emission Legal
Street/Strip Weapon
For the maximum high performing street/strip LS1/LS2/LS6 aluminum cylinder heads AFR’s
all new 225cc emission legal E/O #D250-4 are hands down the best choice.
Specifically designed for 1997 to present Gen-3 Chevy Corvettes,
Camaros, and trucks. AFR’s LSX cylinder head offers unmatched flow
performance and features 2.080 intake and 1.600 exhaust valves with
AFR’s iron ductile interlocking valve seats. Our 225cc cylinder head is
ideal for normally aspirated 396C.I. to 427C.I. For a wild 346 ci
the 225 is a good choice, however some low RPM loss of torque might
occur. It is available with 62cc, 65cc, and 72cc combustion chambers. AFR’s
LSX is a direct bolt on, no special parts required (see footnotes here). 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 unparalled durability. An exclusive
new modern combination 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 typcially 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 our #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.
Our upgrade spring has higher seat and open pressures (155/410+) to better
reduce the risk of valve float in more aggressive applications.
FYI: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.
225cc Small Bore LSX Aluminum Cylinder Head Flow Chart
AFR 1660 test on 3.900 bore
225cc Large Bore LSX Aluminum Cylinder Head Flow Chart
AFR 1630 tested on 4.125 bore
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
3-angle Radiused Valve Job
AFR #7208
Bead Lock Intake Valve, 2.080" standard length
AFR #7228
Bead Lock Exhaust Valve, 1.600" staindard length
AFR #8019
1.270" OD Hydraulic Valve Spring with dampener, 155 lbs. on seat, .650” maximum lift
Specifications, Features, and Optional Supporting Components
11mm ARP 70ft. lbs. w/ Moly
Head Torque
8mm 23ft. lbs. w/ Moly
Head Torque
AFR #6859 or GM#12558573
Exhaust Port Gasket Fel-Pro #1440
225cc
Intake Port Volume
85cc
Exhaust Port Volume
Jesel or TD Shaft Mount
LS6
Suggested Manifold
FAST TPIS
Suggested Manifold
AC 41-974 Platinum
Spark Plug Starting Range
62cc, 65cc or 72cc
Combustion Chambers
1.250
Spring Pocket
Stock
Valve Spacing
Stock
Rocker Arms
Stock
Valve Angle
.006" per cc
Flat Mill (milling options available)
Note: Milling head deck will affect flow numbers. |
