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manifold and timed vacuum...one has vacuum at idle and decreases as the revs come up(manifold) and ported has no vacuum at idle and increases vacuum as the revs come up..
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It's called "drag racing" if they called it "tic..tic..WHAM!..BANG! F*&K!!!", they'd have to keep the magazines under the counter with the other men's publications
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67 lwb..first hotrod in 25 years..540 best ET is 9.45 @ 141.44
Anderson,CA
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