When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.
It's not either of the 2 you posted, both of those are overhead cam. The LT1 is a pushrod V8 built on the traditional SBC block, so it has one cam in the block.
the advantage of one cam? vs no cam? is that what youre saying? unless you have rotary, you have a cam. over head cam, less moving parts, higher reving, more valves per cylinder