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The heads are completely different. VTEC cams will simply not go into a non VTEC head.
A VTEC head has much different rocker assemblies. There are two different sets of rocker assemblies: VTEC and non VTEC. Before VTEC is engaged, the rockers for the VTEC lobe are unlocked, so the valves just utilize the non VTEC lobe. As soon as VTEC enages, the rockers lock, and the valves use the more aggressive VTEC lobe.
Non VTEC engines only have the single set of rocker assemblies. In addition, the space between camshaft lobes is larger, since there's only one grind.
Bottom line: you can't have VTEC or VTEC cams with a non VTEC head.
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