If I went with the solid lifters I'd also have to get oil restricting pushrods, I don't know about springs yet. With the cam I have now probably not but if I went to a solid roller camshaft I might.
Got an answer from Butler: I could use the cam I have now and run solids with a very tight lash, would still change the duration; Says Crower and Johnson are the same; Comp used to be made by Johnson but have changed supplier, says the lifters are still the same though; Says Lunatis and Howards are made by Morrell, but there's not much difference in any of them.
That last statement didn't give me much confidence.
