Lash Caps

I have looked into using lash caps and most will add .060-.080 to the length. A suction is created between the lash cap and the valve to hold them on. There is also a small hole in the top that relieves the suction to get them back off. I'm not really sure how much room you need for a good fit. Crane cams recommends .030 clearance for the bottom of the cap. I would also not grind them down to make them fit because you may cause the oil suction to not work correctly. There is quite a bit of info on the net about them too. just google lash caps and see what you get. You could also get a custom set of pushrods to make up the distance.