The blacktop has lighter internals which might be also weaker, but it's a bit more quickly. No hurt if you're not executing any huge mods, but any compelled induction and you will be needing to uprate the blacktops internals. The AFM design is in fact desired as it will permit https://4age-for-sale69258.dailyhitblog.com/32140732/rumored-buzz-on-4a-ge-engine-for-sale