Thread: 455 timing
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Old January 1st, 2009, 12:30 PM   #8 (permalink)
Jeff_Keryk
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Join Date: Dec 2008
Posts: 6
Ported vs Manifold vacuum advance - there are many opinions on this. I use full manifold for several reasons. More advance at idle, which gives better off idle transition. More idle timing results in cooler operating temps. Ported timing came in with the somggers which wanted to raise operating temps. Just my 2 cents, others can chime in...
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