low vacuum?

[BigDuke6]

Dealing with a couple issues, so I guess I'll start at idle and work my way up. Pulling 10/12" of vacuum at idle(900) on a reliable gauge. The vacuum does hunt around a little. Checked for vacuum leaks with brake cleaner, none. Pulled the valve covers after I warmed it up and everything looks unform on the travel of the rockers while cranking. It is an older postons 110 cam, and I know some had issues wiping them. Any ideas?

 

[Fast4Ward]

Start with a compression test and look up how to read engine vacuum behaviour. Might find ur problem.


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[BigDuke6]

Will do...motor' fairly fresh, hope its not hurt

 

[BigDuke6]

Got between 120 and 125 in all the holes. If I installed my cam incorrectly in the advance position, would this cause low vacuum?

 

[V6sleeper]

Check for any exhaust leaks, headers are the likely culprit , then work down the line..

 

[BigDuke6]

Just finished welding up theses headers and a crack on the down pipe by the external gate flange. What do you think about cam timing?