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| Holley 390 Power Valve https://slantsix.org/forum/viewtopic.php?t=53989 |
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| Author: | moparlewellen [ Mon Dec 02, 2013 9:20 am ] |
| Post subject: | Holley 390 Power Valve |
I have a 71 dodge dart with a 225 slant six. I have rebuilt it, installed a comp cam, milled the head .050, valve job, 4bbl intake, and a Holley 390 carb. My question is what is the best power valve for a daily driver (40 miles interstate a day). I installed a 8.5, the old one didn't have a number on it. I was just wondering what other people think. Im running #46 main jets. I live in Colorado at 7,200 feet. |
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| Author: | wjajr [ Mon Dec 02, 2013 11:02 am ] |
| Post subject: | |
Power Valve selection by Holley here. |
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| Author: | DusterIdiot [ Mon Dec 02, 2013 4:19 pm ] |
| Post subject: | Yep. |
Quote: I installed a 8.5, the old one didn't have a number on it. I was just wondering what other people think. Im running #46 main jets. I live in Colorado at 7,200 feet.
the Holley site is OK, but is more for the V-8 guy and doesn't take into account the six can run high vacc on the street then quickly dip to 6" on part throttle passing a truck, it also is not as accurate for people running a heavy vehicle with the smaller engine ... Most folks tend to run a 10.5 PV, but with your altitude may be more in the 9.5/8.5 range...that being said....I have successfully run dual stage PV's in the Hpak duster for street use (12.5/6.5) since I only needed partial enrichment in the car not a bucket of fuel on passing (i would swap to a 10.5 at the track, then swap back).How is your in gear vacc. reading at highway speed? and how far does it dip when you get on it to pass a semi? -D.Idiot |
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