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Ford Mustang Cylinder Head Porting

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What hurts small-block Ford heads is exhaust-port size. Anytime exhaust ports are a thumb's width in size, they're certainly too small, but Mark says you can work these small exhaust ports and improve flow dramatically. Even the Thermactor-based castings can be worked and opened up for better flow.
Ford Mustang Cylinder Head Porting - Head Trip

 What hurts small-block Ford heads is exhaust-port size. Anytime exhaust ports are a thumb's width in size, they're certainly too small, but Mark says you can work these small exhaust ports and improve flow dramatically. Even the Thermactor-based castings can be worked and opened up for better flow.  View Related Article

 

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