The blacktop has lighter internals which can be also weaker, but it's kind of quicker. No hurt if you are not doing any significant mods, but any forced induction and you will be needing to uprate the blacktops internals. just lately purchased a new JDM Engine 4AGE Blacktop from NW, https://juliuspsutt.onesmablog.com/4a-ge-engine-for-sale-things-to-know-before-you-buy-66937835