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180 degree headers??
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<blockquote data-quote="greenlion" data-source="post: 308552" data-attributes="member: 1675"><p>You separate the cylinders that fire after each other on the same bank so that you don't have two exhaust pulses hit the collector at the "same" time. On a SBC/BBC these are 8/4 and 5/7 (firing order 18436572). To do 180 headers you would bring the middle tubes from one side into a collector with the outer tubes from the other side. One collector will have 1/7/4/6 and the other will have 2/8/5/3. </p><p></p><p>This picture may help:</p><p><a href="http://www.speedwaymotors.com/Schoenfeld-Headers-180-1-Small-Block-Chevy-180-Degree-Headers,3517.html" target="_blank">http://www.speedwaymotors.com/Schoenfeld-Headers-180-1-Small-Block-Chevy-180-Degree-Headers,3517.html</a></p><p></p><p>You would use a smaller collector to increase mid-range torque (since the larger collector is no longer need to accommodate the back to back pulses). The longer tubes usually needed to fit these also improves mid range (at the expense of upper rpm power, depending on primary length and max rpm).</p></blockquote><p></p>
[QUOTE="greenlion, post: 308552, member: 1675"] You separate the cylinders that fire after each other on the same bank so that you don't have two exhaust pulses hit the collector at the "same" time. On a SBC/BBC these are 8/4 and 5/7 (firing order 18436572). To do 180 headers you would bring the middle tubes from one side into a collector with the outer tubes from the other side. One collector will have 1/7/4/6 and the other will have 2/8/5/3. This picture may help: [url=http://www.speedwaymotors.com/Schoenfeld-Headers-180-1-Small-Block-Chevy-180-Degree-Headers,3517.html]http://www.speedwaymotors.com/Schoenfeld-Headers-180-1-Small-Block-Chevy-180-Degree-Headers,3517.html[/url] You would use a smaller collector to increase mid-range torque (since the larger collector is no longer need to accommodate the back to back pulses). The longer tubes usually needed to fit these also improves mid range (at the expense of upper rpm power, depending on primary length and max rpm). [/QUOTE]
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