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Is this Low engine vacuum? [message #146625]

Sat, 15 October 2011 18:50

Keith V

Messages: 2337
Registered: March 2008
Location: Mounds View,MN

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Senior Member

I have a pretty freshly rebuilt ( last year) 455, it was bored .030 over and uses a Jim bounds cam.

I'm trying to get it to use a normal amount if fuel (8 to 10 mpg)
I bought a Wide band O2 sensor, LC1, and redid the exhaust with 3" pipe. I'm getting about 14AFR at cruise and lower when I step on it

At idle in drive I'm getting 15" of vacuum with a little needle shake. I was expecting closer to 20 and a smooth needle, but am hoping Jims cam lowers it?

Timing should correct, I'm going to check it tomorrow.
Idle speed is ~700 rpm

Does this vacuum see right for a Jim bounds cammed engine??

Keith Vasilakes
Mounds View. MN
75 ex Royale GMC
ask me about MicroLevel
Cell, 763-732-3419
My427v8@hotmail.com

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[Message index]

		Is this Low engine vacuum? By: Keith V on Sat, 15 October 2011 18:50
		Re: [GMCnet] Is this Low engine vacuum? By: kelvin on Sat, 15 October 2011 20:01
		Re: [GMCnet] Is this Low engine vacuum? By: James Hupy on Sat, 15 October 2011 20:29
		Re: [GMCnet] Is this Low engine vacuum? By: jhbridges on Sun, 16 October 2011 09:57
		Re: Is this Low engine vacuum? By: Jim Galbavy on Sat, 15 October 2011 20:42
		Re: [GMCnet] Is this Low engine vacuum? By: jimk on Sat, 15 October 2011 20:48
		Re: Is this Low engine vacuum? By: roy1 on Sat, 15 October 2011 20:57
		Re: Is this Low engine vacuum? By: Keith V on Sun, 16 October 2011 11:36
		Re: [GMCnet] Is this Low engine vacuum? By: jimk on Sun, 16 October 2011 11:43
		Re: Is this Low engine vacuum? By: fred v on Sun, 16 October 2011 18:11
		Re: Is this Low engine vacuum? By: Keith V on Sun, 16 October 2011 20:03
		Re: Is this Low engine vacuum? By: philipswanson on Wed, 19 October 2011 11:24

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