I am finding 26" of vac at idle hard to believe. Dropping down a steep grade with my foot off the gas my 360 pulls 24.5"
I had readings like that with my old gauge, It read 5" with the engine off!
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| Author: | Rug_Trucker [ Tue Jan 06, 2009 6:36 am ] |
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I am finding 26" of vac at idle hard to believe. Dropping down a steep grade with my foot off the gas my 360 pulls 24.5" I had readings like that with my old gauge, It read 5" with the engine off!
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| Author: | SV162 [ Tue Jan 06, 2009 6:04 pm ] |
| Post subject: | |
I changed from a 350 Holley to a 390 last year and I must say the 390 feels a lot more responsive off the line. I haven't really noticed much difference in fuel economy, but to be honest it's hard not to open those 2 extra barrels from time to time......just for fun.  In the last few weeks I've put in a 4.5 power valve which seems to have a helped a bit with the economy. My vac is 9" in gear and around 14" in Neutral. FWIW going from the 350 to the 390 I picked up 0.15 sec down the 1/4 mile. So performance wise the 2 carbs aren't streets appart, not on my engine anyway, but the 390 feels better on the street. |
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