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Old 03-06-2006, 04:25 PM
Dart14 Dart14 is offline
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Join Date: Jan 2005
Location: Lincoln University, PA
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Default Cam size effect on engine vacuum

Does anyone have any figures on cam size and effects on engine vacuum ? Bottom line is engine has to pull 14" of vacuum @ 1000 rpms - how much valve lift and duration or combination can you do and still keep 14" of vacuum?
Engine is a 10.5 compression 340
Previous 318 with a .454 lift and 268 duration only pulled about 14.4".Had 360 unmilled heads so compression was lowwwww.
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