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Chevy NASCAR Engine SB2 Cylinder Head

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You may be asking yourself why the ports are so small. These are the as-cast heads from GM. Each team spends numerous hours researching and developing special porting techniques to maximize flow numbers (within the rules of course). Porting must be done in a spherical manner; teams may not change the positioning of the port (higher or lower).
Chevy R07 NASCAR Engine - The Future Is Now

 You may be asking yourself why the ports are so small. These are the as-cast heads from GM. Each team spends numerous hours researching and developing special porting techniques to maximize flow numbers (within the rules of course). Porting must be done in a spherical manner; teams may not change the positioning of the port (higher or lower).  View Related Article

 

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