Posted this on tech but was curious what this crowd would say...

What is a normal idle vacuum for a cammed 5.3L? My cam is 212/212 .561/.561 114 LSA, that's an overlap of -16 deg. It idles warm at 15-16 inHg at ~630 rpm, three different gauges say the same thing. I thought it was supposed to be a little higher. It has not been tuned for this cam yet.

I'm trying to figure out if I have a vacuum leak. Thanks!

 

I was recently searching this same topic, just out of curiosity. Stock seems to be about 20 inches or thereabouts. Mine idles hot at 14" in gear, 15" in park, and 11" with the A/C on for comparison.

 

What cam do you have?

 

222/226 113

 

That sounds about right, what the issue? Anything specific? Is that idle, in park with AC off?

 

Should be about 19.5" stock.

 

It's a T56, this is in neutral AC off. It has a hanging idle issue, but it might be the throttle cracker thats not setup right for the T56.

 

I get 8" cold, 10" hot in my cammed 6.0. Lol

 

This is correct

 

I am rite about 15-18 112lsa