Edelbrock Performer RPM Cylinder Head - Chamber Size: 72cc 121002 The Stilo ST5 FN Zero

The Stilo ST5 FN Zero helmet offers the pinnacle of formula racing helmets

Automatically Extends When Door Opens

1-3/4 in Diameter Tube

Founded in 1970

2011-2017 Ram 1500

Edelbrock Performer RPM Cylinder Head - Chamber Size: 72cc 121002 The Stilo ST5 FN ZeroCylinder Head Specifications:; Combustion chamber volume: 87cc; Intake runner volume: 215cc; Exhaust runner volume: 175cc; Intake valve diameter: 2. 11"; Exhaust valve diameter: 1. 66"; Valve stem diameter: 11 32"; Valve guides: Manganese bronze; Deck thickness: 5 8"; Valve spring diameter: 1. 46"; Valve spring maximum lift: . 575"; Rocker stud: 7 16"; Guideplate: Hardened steel; Pushrod diameter: 5 16"; Valve angle: 14 ; Exhaust port location: Stock