2.8 HO vs Standard Heads

Ever wonder why that 2.8 in that other car was a dog and your Fiero motor was so much better? It comes down to the HO (High Output) design.

• The HO motor has higher compression.
• The HO heads have significantly larger valves for better flow.
• The HO motor features a "lumpier" camshaft.

Camshaft Profile

This scan shows the exact specs used in the 2.9 build. The camshaft provides .426 lift on both intake and exhaust using 1.52 ratio rockers.

Transmission Gear Ratios

Choosing the right transaxle is critical for balancing 0-60 acceleration vs. top-end speed and fuel economy. The 3.32 ratio provides a great balance for a high-powered V6 or V8 swap.

For example, at 6000 RPM, the 3.32 ratio Econ trans allows for 100 MPH in 3rd gear, reducing shifting time for high-torque applications.