Contains one large plenum area with differing runner lengths?

• A. Dual-plane
• B. Single-plane
• C. Hybrid-plane
• D. Multi-plane

Answer: (B)

A single-plane intake design uses one large plenum that feeds all cylinders, and its runners can be designed with different lengths to tune the air pulses for each cylinder across a broad RPM range. This setup emphasizes flow and throttle response at higher engine speeds, since the single large plenum doesn’t split the pulse into two distinct plenums. In contrast, a dual-plane design splits into two plenums (one per bank), which tends to standardize runner lengths within each bank to boost low‑end torque. Because the description specifies one large plenum area with differing runner lengths, it matches the single-plane configuration best.