4 Door vs 2 Door Power Valve

Power Valve Block Off

A 4-door power valve provides more aggressive fuel enrichment due to its four fuel enrichment doors, making it ideal for high-performance and racing applications. In contrast, a 2-door power valve delivers a more controlled and gradual fuel flow, making it better suited for daily drivers and street vehicles where fuel efficiency is a priority. Power … Read more

4.5 vs 6.5 Power Valve

4.5 vs 6.5 Power Valve

The 4.5 and 6.5 power valves differ in the vacuum level at which they open, with the 4.5 opening at 4.5 in-Hg and the 6.5 at 6.5 in-Hg. The 4.5 valve is better suited for high-performance engines with lower vacuum, like those with aggressive camshafts, while the 6.5 is ideal for street engines with higher … Read more