Complete header in aluminum with staright plugs for Chevrolet Small Block 55-59 (Two types of bolt patterns towards Intake manufold and both new and old bolt pattern towards valve covers)
Chamber/Runner: 64cc/205cc
Max lift: 0.600"
Springs: 1.437"
Rocker arm studs: 3/8"
Guideplates: 5/16"
Exhaust/intake valve: 1.60" / 2.02"
High spring tension for roller cam. Price each.