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When I drained the front fuel bowl of my Holley to replace the leaking power valve this morning no more than 2 ounces of gasoline came out. It was around 95 degrees when I got home and shut it off yesterday afternoon and almost all of the gasoline in the fuel bowls evaporated over night. There was just enough gasoline left to give the accelerator pump a shot or two. My push button fuel bowl priming switch solved the "morning after" cold start problem.

My engine produces around 11" Hg of vacuum at idle in NEUTRAL but only 5.5" in DRIVE so that's why I chose a 3.5" Hg power valve. Because of the low vacuum in DRIVE that's why I am running a 2000 rpm stall torque converter to allow it to idle easier.
 
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