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Although both heads share roughly the same dimensions externally, the combustion chamber on the VTEC head (on the right) is slightly smaller, resulting in higher compression and more power. The VTEC head also has larger ports and bigger valves.
Hybrid How-To No 16: Building the LS/VTEC engine

 Although both heads share roughly the same dimensions externally, the combustion chamber on the VTEC head (on the right) is slightly smaller, resulting in higher compression and more power. The VTEC head also has larger ports and bigger valves.  View Related Article

 

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