| For the maximum street/strip LS1/LS6 aluminum cylinder head AFR?s all new 225cc emission legal head are hands down the best choice. Specifically designed for 1995 to present Gen-3 Chevy Corvettes, Camaros, and trucks. AFR?s LS1 head offers unmatched flow performance and features 2.080 intake and 1.600 exhaust valves with AFR?s iron ductile interlocking valve seats. The 225cc is ideal for normally aspirated 396C.I. to 427C.I. It is available with 62cc and 72cc combustion chambers. An affordable ?as cast? version is also available, just choose what you would like in the drop-down menu below.
AFR?s LS1 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 unparalled durability. An exclusive new modern combination chamber design with double quench pad area helps the LS1 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 typically experience valve float at 6000-6200 RPM because of their fast ramp rates. AFR suggest you upgrade your springs to AFR part #8019, 1.250 O.D. double with dampener valve spring with higher pressures(145lbs on seat, 390+lbs at .600 lift) to reduce the chances of valve float at higher RPM?s with the #8019 spring AFR recommends Comp Cams R style lifter.
Note: Heads are sold as a set. Available with parts ready to install or without parts, please choose in the drop-down menu below. Not legal for sale or use on pollution controlled motor vehicles in the United States. The heads that are priced above are the heads described in the title.
Basic Package Components
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
3-angle Raduised Valve Job
Intake Valve, 2.080? standard length #7208
Exhaust Valve, 1.600? standard length #7228
1.250? O.D. Hydraulic Valve Spring with dampner, 130 lbs. on seat, .581? maximum lift (upgrades available) #8017
7? 1.250 Titanium Retainers #8512
7? Valve Locks #9007
Valve Seals #6612
Hardened Shims #8042
Intake Valve Seats #9058
Exhaust Valve Seats #9069
Bronze Valve Guides #9051
All Accessory Holes are Predrilled & Tapped!
Specifications, Features, and Supporting Components
Head Torque: 11MM ARP 70w/Moly 8mm 23w/Moly
Exhaust Port Gasket: GM#12558573/ Fel-Pro #1440 AFR#6859
Intake Port Volume (as cast): 220cc
Intake Valve Size: 2.080"
Exhaust Port Volume (as cast): 78cc
Head Gasket: GM#12498543 or 12498544, Fel-Pro#1041, AFR#6847
Exhaust Valve Size: 1.600"
Head Bolts & Studs: Standard ARP, AFR #6330, #6331 & #6332
Head Bolt Washers: Standard ARP, AFR #6328 & #6329
Suggested Manifold: LS6 or FAST
Accessory Holes Are Drilled: Yes
Spark Plug Starting Range: AC 41-974 Platinum
Combustion Chambers: 66cc or 76cc
Spring Pocket: can be cut to 1.250-can be machined to 1.550 O.D.
Valve Spacing: Stock
Rocker Arms Location: Stock
Valve Angle: Stock
Angle Mill (milling available): .008? per cc
Flat Mill (milling available): .006? per cc
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