Forced Induction
When forced induction is used, large port flow is not as important as it is when an engine is naturally aspirated. This means that the generally inferior flow of a reverse-flow head is less of a disadvantage. In the early days of turbo charging a reverse-flow head allowed the compressor outlet of a turbocharger to blow directly into the inlet manifold with either a blow-through or draw-through carburettor and no intercooler. This allowed the use of shorter inlet plumbing which decreased turbo lag and lowered flow restriction. Modern turbocharged configurations utilizing intercoolers and fuel injection are more difficult to plumb up to a reverse-flow head and are ideally suited to a cross flow head where the turbo is on the exhaust side of the engine, the charge crosses through an intercooler in front of the engine and into the inlet manifold on the other side.
Read more about this topic: Reverse-flow Cylinder Head
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