AFR 205CC LS1 Mongoose Street Heads

AFR 205cc LS1 Mongoose Street Head

AFR LS1 205cc fully CNC ported, 66cc chambers, Small Bore, complete w/parts

These heads are completely assembled and ready to bolt on.

Price is for a pair.

For the ultimate high performance street LS1/LS2/LS6 aluminum cylinder head AFR’s all new 205cc emission legal E/O # D250-4 are your only choice. Specifically designed for 1997 to present Gen-3 Chevy Corvettes, Camaros, and trucks. AFR’s LS1 cylinder head offers unmatched flow performance (298 CFM at .600lift) and features 2.020 intake and 1.600 exhaust valves with AFR’s iron ductile interlocking valve seats. With only 205cc port volume (same as stock LS1 head) this is an incredible 70 CFM increase over stock casting, creating unbelievable port velocity and performance. Our 205cc cylinder head is ideal for normally aspirated 346C.I. to 396C.I. It is available with 66cc combustion chambers. AFR’s LS1 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 unparalleled durability. An exclusive new modern combustion 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 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. AFR also recommends the use of Crane or GM Billet lifters in conjunction with our #8019 spring upgrade.

Package includes:

3-angle Radiused Valve Job

Intake Valve, 2.020" standard length AFR #7207

Exhaust Valve, 1.600" staindard length AFR #7228

1.290" OD Hydraulic Valve Spring with dampener,

135 lbs. on seat, .600: maximum lift AFR #8017

7° 1.250 Titanium Retainers AFR #8512

7° Valve Locks AFR#9007

Valve Seals AFR #6612

Spring Cup AFR #8042

Intake Valve Seats AFR #9059

Exhaust Valve Seats AFR#9069

Bronze Valve Guides AFR#9051

Specifications and Features

• Head Torque 11MM ARP 70ft. lbs. w/ Moly 8mm 23ft. lbs. w/ Moly
• Exhaust Port Gasket GM#12558573/Fel-Pro #1440 AFR #6857
• Intake Port Volume 205cc
• Intake Valve Size 2.020
• Exhaust Port Volume 84cc
• Head Gasket Fel-Pro #1041, AFR #6847
• Cometic AFR #6846
• Head Bolts & Studs Standard ARP, AFR #6330, #6331 & #6332
• Head Bolt Washers Standard ARP, AFR #6328 & #6329
• Jesel or TD Shaft Mount
• Suggested Manifold LS6 or FAST, TPIS
• Spark Plug Starting Range AC 41-974 Platinum
• Combustion Chambers 66cc or 76cc
• Spring Pocket 1.250
• Valve Spacing Stock
• Rocker Arms Stock
• Valve Angle Stock
• Angle Mill (milling options available) .008" per cc
• Flat Mill (milling options available) .006" per cc

Note: Milling head deck will affect flow numbers