One Pair of Performance Aluminum Cylinder Heads (Alsi7mg) for Chevy Small Block V8 engines with a minmum of 4" Bore (101,6mm) and Flat Hydraulic Tappet Camshaft up to 0.500" Lift and a Maximum of 232° Duration @ 0.050" :

302" 5.0L, 327" 5.4L, 350" 5.7L and 400" 6.6L

- Assembled and Flow and Quality tested
- Straight Spark Plug Holes (23°)
- 64cc Combustion Chambers
- Port Sizes: 2.080" x 1.270" 5/16 Radius, 1.380" x 1.420"
- 200cc Intake Ports
- Manley "Pro-Flo" 2.020" Intake Valves and 1.60" Exhaust Valves (Stainless Steel)
- Manley Single 1.250" Valve Springs with 4140 CRMO Valve Retainers and 7° Manley Valve Locks
- Manley Viton® Valve Stems Seals
- Mangan Bronze Valve Guides
- Dart Guide Plates for 5/16" Pushhods and ARP 3/8" Rocker Studs
- With 3/8-18" NPT Temperature Sensor/Sender Hole; Plugs included
- Accepts Centerbolt and Perimeter Bolt Valve Covers, accepts 8-Bolt Vortec and Standard 12-Bolt Intake Manifolds

Improves Power throughout the RPM Range for greater Throttle Response and Top-End Horsepower
Perfect for Street Performance, Daily Driver, Street Rods and Muscle Cars

Recommendations :
Valve cover gasket centerbolt rubber #2011483
Valve Cover Gasket Perimeter/Rim Bolt Rubber #2011428
Valve Cover Gasket Perimeter/Rim Bolt Cork #2011427
Cylinder head gasket for 350-383cui. #20105
Cylinder head gasket for 400cui. #20113
Cylinder head screws #03534
Intake spider gasket 302/350 cui. until 1986 #201853
Intake spider gasket 302/350 cui. from 1987 #201922
Exhaust manifold gasket cast manifold #201909
Exhaust manifold gasket manifold #351502

Spark plugs for compression:
8-9.0:1 - NGK 5155 FR4
10.0:1 - NGK 7373 FR5
11.0:1 - NGK 6962 BKR6E

(Note: applies to SBC 400cui., there are no steam holes drilled in the cylinder head, but it is prepared for them, you can also drive without them)