Pipes for Power
Tri-Y headers connect two pairs of pipes from each bank into two small Y-pipes and then join those larger pipes into a small collector. These photos show how the driver-side small-block header connects cylinders No. 1 and No. 5 into one pair and No. 3 and No. 7 into the second pair. This also steps the pipe diameters from four 1 5/8-inch primaries to a pair of 1 7/8-inch pipes. View Related Article
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