If you only draw from one header it will only see manifold pressure when that cylinder is on the intake stroke. You will get a pulsing effect on the dizzy and inconsistant timing advance. That is why you need to draw from all four headers.
If you connect all four into a small container, then connect that to the dizzy you will get a steady vacuum flow
Last edited by davedew : 21st June 2012 at 12:53 PM.
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