Looking at these picks of the rockers, I have a similar question. I have a 66 Barracuda with 273. I have a hydraulic cam and lifters and had adjustable rockers, originals I think. And they had spacers between the rockers. I replaced the adjustables with Hydraulic rockers like the ones shown in FinD pics. When I installed them I did not use any spacers as I read on mopardiy.com that they do not require the spacers. And in looking at the photos in this thread, I don't see any either? So can someone give the low down on whether or not they do or don't need spacers?