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Current Pontiac Cylidner Head Packages SD Performance Porting

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Though some hand touch-up is performed, the entire SD Performance porting process is fully automated. There's also a specific program for the closed-combustion-chamber '67 No. 670 castings (not shown), which includes relieving the intake valve and spark plug. This gives the chamber somewhat of a heart-shaped appearance.
Pontiac Cylinder Head Packages - Cylinder Head Symphony

 Though some hand touch-up is performed, the entire SD Performance porting process is fully automated. There's also a specific program for the closed-combustion-chamber '67 No. 670 castings (not shown), which includes relieving the intake valve and spark plug. This gives the chamber somewhat of a heart-shaped appearance.  View Related Article

 

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