4.6L 2v Discussion forum for the 4.6L 2v Mustangs

Low vacuum with stage 3 comp cams

Old May 4, 2022 | 05:47 PM
  #1  
mike burns's Avatar
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Joined: Sep 2015
Posts: 3
From: Niagara Region
Low vacuum with stage 3 comp cams

Hi Everyone. I have installed a brand new engine from MMR racing, which includes what they call "stage 3" comp cams. I've got it fired up but I noticed that my engine vacuum at idle is only about 9 inches of vacuum. This seems quite low to me, but I have never had this big of a cam in my engines before. So my question is: does this seem low to you guys??? I suspected a vacuum leak, so I smoked the manifold, with no results.

2002 Mustang GT, MMR racing 4.75 2v engine, Lentech 4r70w, 4.10's, Nitrous
Has run 11.34 @119 (previous engine)
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