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225cc LS1 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 LS1 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 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 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:AFR highly recomends the use of Crane or GM Billet lifters in conjunction with our #8019 spring. 
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225cc Large Bore LS1 Aluminum Cylinder Head Flow Chart |  | 225cc Small Bore LS1 Aluminum Cylinder Head Flow Chart |  |
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225cc Mongoose LS1 Aluminum Racing Cylinder Head Part Numbers CNC Ported Pairs of Heads Complete With Parts or Ready to Install
CNC Street Porting | Description | Part Number | | 225cc Large Bore CNC Ported w/ parts 62cc | 1610 | | 225cc Large Bore CNC Ported w/o parts 62cc | 1620 | | 225cc Large Bore CNC Ported w/ parts 72cc | 1630 | | 225cc Large Bore CNC Ported w/o parts 72cc | 1640 | | 225cc Small Bore CNC Ported w/ parts 65cc | 1660 | | 225cc Small Bore CNC Ported w/o parts 65cc | 1670 |
| Basic Package Components | Part # | 100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
100% CNC Ported Intake Ports
3-angle Radiused Valve Job | | | Intake Valve, 2.080" standard length | AFR #7208 | | Exhaust Valve, 1.600" staindard length | AFR #7228 | 1.270" OD Hydraulic Valve Spring with dampener,
155 lbs. on seat, .650" maximum lift | AFR #8019 | | 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, Features, and Optional Supporting Components |
| Head Torque | 11MM ARP 70ft. lbs. w/ Moly 8mm 23ft. lbs. w/ Moly | | Exhaust Port Gasket | GM#12558573/Fel-Pro #1440 AFR #6859 | | Intake Port Volume | 225cc | | Intake Valve Size | 2.080 | | Exhaust Port Volume | 85cc | | Head Gasket | Fel-Pro #1041, AFR #6847 | | Cometic | AFR #6846 & #6848 | | 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 | 62cc, 65cc, or 72cc | | Spring Pocket 1.250 -can be machined to 1.450 OD | | | 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
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Proudly Serving:
The United States, Canada, Mexico, and the rest of the performance minded world We Ship Internationally Hours of Operation:
Monday – Saturday,
8 a.m. – 6 p.m.
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