ProMaxx Performance XXTREME Assembled 260 cc Rectangle Port Cylinder Heads for LS3 w/4 in. Min. Bore w/63 cc Combustion Chambers
723-3163
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LS3 w/4 in. Min. Bore [260 cc Rectangle Ports]
ProMaxx 3163 XXTREME Assembled Cylinder Heads Features:
- High-flow as-cast port design
- Ultra-smooth 356-T6 aluminum casting
- 21-4N stainless 1 piece swirl polished back cut valves
- 5-angle valve job
- 11-Degree valve angle
- Hardened steel valve seats
- OEM LS3 valve spacing
- Manganese bronze diamond honed guides
- Viton valve seals
- Built-in raised valve cover rail
- .750 in. deck thickness
- Billet LS3 OEM rocker stand
- For use with standard or 6 bolt pattern
- Large spring pockets
ProMaxx 3163 XXTREME Assembled Cylinder Heads Notes:
- Requires 4 in. minimum engine cylinder bore
- Requires LS3 intake rocker arms
- Included valve springs for solid roller cam with tool steel retainers specs:
- .700 in. Maximum valve lift
Specifications:
Motor Vehicles
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Tools:
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Electrical Cords
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