This is false. I had a 408 with good aluminum heads, solid roller cam, etc and swapped in the less desirable pre-eagle 5.7 with only a cam and some home porting on the heads. The 5.7 went faster in the 1/4 than the 408. Same car, same weight. I'll repeat, that was a stock early 5.7 with a cam that makes more power than a built 408. If you put the same money it takes to build a stroker small block, you could have an easy 650Hp Gen 3 hemi than runs on pump gas.