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They have their ups and downs. Just speaking mechanically (they would come with different electronics, which could be interchanged), the dual-port ones have hydraulic lash adjuster, where the single port ones are solid. Most single port engines are an interference engine, but that also comes with a slight (.2, IIRC) bump in compression and power. Borla (and knockoff) headers are readily available for dual port, not almost at all for single port.

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They have their ups and downs. Just speaking mechanically (they would come with different electronics, which could be interchanged), the dual-port ones have hydraulic lash adjuster, where the single port ones are solid. Most single port engines are an interference engine, but that also comes with a slight (.2, IIRC) bump in compression and power. Borla (and knockoff) headers are readily available for dual port, not almost at all for single port.

 

96 is single port, none interference, roller follower/hydraulic tensioned lifters.

 

I believe the single port engines have a bit more low end torque

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