The Ultimate Bolt-on Emissions Legal Street Weapon
The AFR Emissions Legal (ARB only, 49 state legal, not California), 195cc intake port LT1 / LT4 small block Chevy aluminum cylinder heads are available only in an angle plug version. These heads feature a 55cc to 65cc combustion chamber with a 64cc exhaust port and a 3/4" thick head deck (ideal for nitrous or blower applications). Standard valves are lightweight 8mm 2.050 intake and 1.600 exhaust with AFR’s hardened ductile iron interlocking valve seats. The exceptional flow characteristics, ideal operating range of 2500 rpm to 6500 rpm (higher rpm ranges possible depending on combination of parts), 23° valve angle, and standard valve spacing make this the perfect street head for 350 cid to 383 cid engines. Designed specifically for 1996 Corvettes or LT4 manifold users. No special parts are required, except for the LT4 intake manifold. Dual valve cover bolt pattern is standard.
The exhaust ports are raised .100" over a standard GM L-98 cylinder head.
| Basic Package Components | Part # |
| 100% CNC Ported Combustion Chambers 100% CNC Ported Exhaust Ports 100% CNC Ported Intake Ports Competition 5-angle Valve Job |
|
| 8mm Bead Lock Intake Valve, 2.050" x 4.900" Overall Valve Length | AFR #7252 |
| 8mm Bead Lock Exhaust Valve, 1.600" x 4.950" Overall Valve Length | AFR #7250 |
| PAC Racing Spring 1.290" OD Hydraulic Roller Dual Valve Spring, 140 lbs on seat, .600" maximum lift, Max RPM 6300-6800 |
AFR #8017 |
| 7° 7° Manley Chrome Moly Retainers 1.245" O.D x .885" I.D x .655" I.D | AFR #8515 |
| 7° Bead Lock Valve Keepers | AFR #9007 |
| ARP 3/8" Rocker Studs | AFR #6409 |
| Adjustable 5/16" Guide Plates | AFR #6103 |
| Viton Valve Seals .600" O.D x .495" I.D | AFR #6612 |
| Hardened Spring Cup O.D Locator 1.380" O.D x .570" I.D | AFR #8042 |
| Ductile Iron Intake Valve Seats 2.200" O.D x 1.750" O.D x .375" Deep | AFR #9060 |
| Ductile Iron Exhaust Valve Seats 1.696" O.D x 1.325" I.D x .305" Deep | AFR #9070 |
| 8 mm Bronze Valve Guides .502" O.D x 2.100" O.A.L | AFR #9051 |
| Specifications, Features, and Optional Supporting Components |
| Head Torque | 65-70 ft. lbs |
|
Intake Port Volume
|
195cc |
| Intake Port Dimension | 2.110" H x 1.265" W 5/16 Radius |
| Intake Port Location | Stock |
| Exhaust Port Volume | 64cc |
| Exhaust Port Dimension | 1.450" H x 1.550" W |
| Exhaust Port Location | .100" Raised |
|
Combustion Chamber Size
|
55cc or 65cc |
| Valve Cover Bolt Pattern |
Center and Perimeter Bolt
|
| Valve Angle | 23° |
| Valve Spring Pocket Diameter | 1.460" O.D |
| Max Valve Spring Pocket Machining | 1.750" O.D |
| Deck Thickness | .750" |
| Minimum Bore Diameter |
4.000"
|
| Flat Mill | .006" per cc 60cc Maximum |
| Angle Mill | .009" per cc 55cc Maximum |
| Minimum Cross Sectional Area | 1.810 sq. in. |
| Spark Plug Dimensions | 14mm x .750" w/Gasket Seat |
| Intake Port Gasket | GM #12524653 LT1 / Fel-Pro #1284 |
| Exhaust Port Gasket, Fel-Pro #1404 | AFR #6834 |
| Head Gasket, 350cid Fel-Pro #1074 |
AFR #6803
|
| SB Chevy Head Bolt Kit, ARP #134-3701 |
AFR #6310
|
| SB Chevy Head Stud Kit, 12 Point Nuts, ARP #234-4301 | AFR #6305 |
| Head Bolt Washers, Manley |
ARP #234-4301 AFR #6320
|
| Stud Girdle GM L98 |
Fel-Pro #1074, AFR #6200
|
| Suggested Manifold | GM LT1 or LT4 |
| Spark Plug Starting Range |
Autolite 3924
|
