Building a 427: Laying the Foundation for Big Power We used Summit Racing Pro LS components to build the bottom end on this bullet. These are high‑quality, track‑ready engine parts chosen to give this 427 strength, reliability, and the headroom for big NA or boosted power. The Summit gear provided the durable foundation we needed for any power goal. Watch to see our selection process and the assembly of some heavy‑duty, big power‑capable hardware, and the full build process that any engine build