LT1-LT4 Modifications 1993-97 Gen II Small Block V8

Engine vacuum question

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Old 08-09-2010, 04:58 PM
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Default Engine vacuum question

Hey guys I have a cc503 cam on my new rebuilt motor and after testing the vacuum at each port I was getting 16-17 inHg at idle. Does this seem too low for the cam that I have??

Im trying to track down a lean condition that is only at idle, according to Datamaster its 132-139 BLM at idle. I checked for vacuum leaks by spraying carb cleaner on each line and didnt find anything. There is no exhaust leaks and I changed another set of injectors with no luck. Any help would be great
Old 08-10-2010, 02:51 PM
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Seems right to me just as long as the readings are steady with no sudden bid dips and recovery.

132 isn't all that bad either unless you're really **** about getting 128. If you are, good luck. If it was me, I wouldn't be concerned.

Jake
Old 08-10-2010, 03:06 PM
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I wish I had your vacuum. I have 10-12" myself. Just concentrate and getting the banks to match then you can easily tweak the tune to get close to 128.
Old 08-10-2010, 06:15 PM
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Alright sounds good guys Ill just tweak the tune a bit!



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