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. Summary of uses The reverse flow head was ideally suited to a production carbureted engine due to its low rpm performance and ease of manufacture. The design could be modified for high performance by porting (in particular siamese) and isolating the inlet manifold from the exhaust header. The configuration is also perfect for carbureted non-intercooled turbo-charging. However, the advent of fuel injection and electronic ignition has made most of the reverse-flow head's advantages redundant in a modern engine and as a result the design has lost its popularity. The reverse-flow head still enjoys some popularity among enthusiasts including Leyland Mini, Chrysler Slant-6, Holden and Ford Inline 6 fans. In fact some Australian Ford enthusiasts consider the 250 2V reverse-flow head to be superior to the Honda designed cross-flow head that replaced it. Notes References External links Cylinder head (reverse flow)