Rebuilding an engine will benefit hugely by renewing the complete valve train assembly - from cam-chain, to tensioners, guides, valve guides, valves, valve-springs, retainers and collets.
The engine will run with far less mechanical thrash, and will have greater long-term reliability and, with accurate valve timing, and new inlet and exhaust valves, will deliver full performance.
Also check the camshafts for wear or damage on the lobes which can also have negative consequences if not addressed.
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Add as many new parts to the same shopping cart as you wish, new valve stem oil seals 12208MBB003 12209MBB003 & valve retention cotters 14781MBB003 for example, and still only pay the same single fixed price shipping cost. Please be aware that this component may have other applications within the Honda model range, so check the part-numbers you order are correct for your model and application. Pro-workshop gasket sealant 08CRAHLG120G - easy to apply with professional results.