The AFR Emissions Legal (versions with heat riser only, CARB EO #D-250-2), 190cc intake port small block Chevy cylinder heads are available in your choice of straight, angle, or L98 angle plug versions. These heads feature a 74cc or 68cc combustion chamber with a 64cc exhaust port and a 3/4" thick head deck (ideal for nitrous or blower applications.) The 68cc chambers are designed for flat top or dished pistons; domed pistons will require additional machining. Standard valves are 2.020 intake and 1.600 exhaust with AFR's hardened ductile iron interlocking valve seats. The exceptional flow characteristics, ideal operating range of idle to 5500 rpm (higher rpm ranges possible depending on combination of parts), 23º valve angle, and standard valve spacing make this the perfect street head for 305 cid to 350 cid engines from 1955 to 1986. Also available for 1987-98 engines with center bolt valve covers and 2 center intake bolts at 72º angle. No special parts are required. Note 305ci requires 1.940-1.550 valves for bore clearance.
190cc Street Head Flow (CFM @ 28" H2O) | |||||||||||
.200 Lift |
.300 Lift |
.400 Lift |
.500 Lift |
.550 Lift |
.600 Lift | ||||||
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
129 |
108 |
195 |
156 |
240 |
178 |
260 |
190 |
262 |
192 |
262 |
194 |
190cc Competition Package Flow (CFM @ 28" H2O) | |||||||||||||
.200 Lift |
.300 Lift |
.400 Lift |
.500 Lift |
.550 Lift |
.600 Lift |
.650 Lift | |||||||
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
Intake |
Exhaust |
135 |
110 |
201 |
157 |
243 |
180 |
264 |
195 |
270 |
202 |
276 |
208 |
279 |
212 |
| CNC Street Ported Heads | |
| Description | Part Number |
| 190cc Street Heads, Angle Plug, 74cc | 1000 |
| 190cc Street Heads, Angle Plug w/heat riser, 74cc | 1001* |
| 190cc Street Heads, Angle Plug w/heat riser, 68cc | 1005* |
| 190cc Street Heads, Angle Plug, 68cc | 1006 |
| 190cc Street Heads, Straight Plug, 74cc | 1010 |
| 190cc Street Heads, Straight Plug w/heat riser, 74cc | 1011* |
| 190cc Street Heads, Straight Plug, 68cc | 1015 |
| 190cc Street Heads, Straight Plug w/heat riser, 68cc | 1016* |
| 190cc Street Heads, L98 Angle Plug w/heat riser, 74cc | 1017* |
| 190cc Street Heads, L98 Angle Plug, 68cc | 1018 |
| Competition Package CNC Ported Heads | |
| Description | Part Number |
| 190cc Street Heads, Angle Plug, 74cc | 1032 |
| 190cc Street Heads, Straight Plug, 74cc | 1085 |
| 190cc Street Heads, L98 Angle Plug, 74cc | 1088 |
100% CNC Ported Combustion Chambers
100% CNC Ported Exhaust Ports
70% to 100% CNC Ported Intake Ports
3-angle Valve Job
Intake Valve, 2.020" standard length, AFR #7204
Exhaust Valve, 1.600" standard length, AFR #7219
1.450" OD Hydraulic Valve Spring, 120 lbs. on seat, .550" maximum
lift, AFR #8020
10º 4140 Chrome Moly Retainers, AFR #8510
10º Valve Locks, AFR #9005
3/8" Rocker Studs, AFR #6410
Guide Plates, AFR #6105
Valve Seals, AFR #6611
Hardened Shims, AFR #6326
Intake Valve Seats, AFR #9060
Exhaust Valve Seats, AFR #9070
Bronze Valve Guides, AFR #9050
Special orders available upon request.
All Accessory Holes are Predrilled & Tapped!
Head Torque: 65-70 Ft. Lbs.
Rocker Stud Torque: 55-60 Ft. Lbs.
Intake Port Gasket: 1.230"x1.990" Fel Pro #1256, AFR #6815
Exhaust Port Gasket: Fel Pro #1404, AFR #6834
Head Gasket: 350cid Fel Pro #1010, AFR #6805; 400cid Fel Pro #1014, AFR #6802
Head Bolts & Studs: Standard ARP, AFR #6310 & #6305
Head Bolt Washers: Manley, AFR #6320
Stud Girdle: AFR #6201
Suggested Manifold: AFR PowerFlo #5030 & 5031
Spark Plug Starting Range: AC FR3LS
Combustion Chambers: 74cc or 68cc
Spring Pocket can be cut to 1.625, no deeper.
Valve Spacing Standard
Rocker Arms Standard
Valve Angle: 23º
Angle Mill (milling available) .008" per cc
Flat Mill (milling available) .006" per cc
Pushrods: 5/16" Hardened AFR #6600 & #6601