I've never done an OHV head before I did the HG on my 92 corolla.

Get the complete head job done (with valve seals, seat, guides, etc) at a proper machine shop and they will get all the valves done right. When you get back the head, with care, take two cams off the head to tighten the head bolts and reinstall the cams with proper timing marks. It was very simple.

I paid $200 for the complete head job on a 4 cylinder corolla (I delivered the head with unremoved cams to the shop) back in 2013.

The repair was done at 220K miles and now I am at 276K miles.... It WORKED!!

I will do it again at anytime.... Make sure to take pictures along the way in case you forget something.

Now that I have "experience" I will not be worried when any HG fails in my 97 4runner or 2000 Land Cruiser.

Good Luck!