I can tell you that my B1/KB deal we had basically no lash cold, and if it was really cold out starting it was no bueno. We had a race in Salt Lake a couple of years ago in late September and it was in the high 30's in the morning and there was no way my car was starting.
That is a good reason to select a cam with ramps designed for enough lash so that a cold engine (aluminum block and heads) still is not zero lash.
A cam designed for 0.016/0.018 hot lash is fine for an iron block, but I like more hot lash for a combo with aluminum block and heads. I wondered why some cams were designed for "tons" of lash, 0.024/0.028, and now that I run an aluminum block I am happy to have one.
