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Old 06-03-2006, 08:09 AM
951mat's Avatar
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Join Date: Jul 2005
Location: Tulsa, ok
Cobra Make, Engine: Lonestar, 427 Center Oiler
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Default Help w/ Power Valves
I recently dyno'd my car at 400 rwhp. It has a 427 center oiler, Holley 750 dual feed w/ electric choke.

The problem was that it was running off the chart rich. I will have them retune on the dyno again soon. One thing I have investigated was the power valve. It has a 6.5 in it (stock). I measured my manifold vacume at idle at +/- 7". According to Holley manuals, this would call for a 3.5 power valve. I want to replace it today. Just curious if this could be the main source of richness. FYI the primary jets are 72. Thanks for any advice.


Mat
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