This is a set of 180 headers. These headers are routed so that each collector sees no sequential firing. This is for a Ford 1-5-4-2-6-3-7-8 firing order (1-8-4-3-6-5-7-2) and if you follow the paths of each cylinder you will see that the exhaust will fire between the left and right collectors evenly. This creates an exhaust sounds similar to a flat plane V8.
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After reading this article, I hope you understand that the crossplane and flat plane crankshafts have a significant effect on how smooth an engine is, how it sounds and its ability to rev. We also learned that the crossplane crankshaft is limited to eight firing orders, of which only three are commonly used. These firing orders always have two cylinders on each cylinder bank that fire sequentially for every 720 degrees of crankshaft rotation.
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By changing firing orders, one can move which two cylinders fire sequentially, which may have some advantages for a given engine design. And it’s that sequentially firing of two cylinders on the same bank that creates the distinct V8 sound.