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#70319 12/30/2006 4:48 PM | Joined: Feb 2005 Posts: 199 Wrench Fetcher | | Wrench Fetcher Joined: Feb 2005 Posts: 199 | This is a very good explaination of vacuum advance and its relation to correct timing in relation to a correct timed engine under load. HERE- http://www.classicchevytrucks.20m.com/vacuum.htm In my case the vacuum advance had a busted diaphram ( I took it apart) which I theroized caused the engine to be "out of time" under load. Hope this helps.Hobert
"The Lord is my shepherd"
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