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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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