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Do you go in detail on rebuilding a DOHC or even SOHC cylinder head on any other HPA videos?
There are so many different head configurations - or rather valve train, that you're going to be better off buying an engine manual for the specific engine you're interested in, if you're looking for specifics.
However, are you thinking more about selecting and installing aftermarket 'performance' parts - when they are going to be required, why, what to watch out for, etc?