Get the most out of your turbo Buick engine with a set of our Champion CNC ported iron heads!  When combined with our ported intake manifold, your engine will realize the benefit of improved intake and exhaust flow and its impact on overall performance.

These CNC ported irons include:

• 46cc CNC Ported Combustion Chambers
• Intake and Exhaust Ports Consistently Ported
• Intake, Exhaust and Valve Cover Surfaces Milled
• Precision Milled Deck Surface
• Rocker Pedestals Machined For aftermarket Rocker Shafts
• Heat Riser Filled with Aluminum
• K-Line Bronze Guide Liners
• Guides Machined for Teflon Valve Stem Seals
• Manley Severe Duty Valves
• New Flat Tappet Valve Springs
• Chrome Moly Retainers
• New Freeze Plugs

Part Number: CHA GN1-4000A

Upgrades, as noted below, are available for roller springs and Viton valve stem seals.