Fuel vs Fat heads

Discussion in 'PSI Superchargers Tech Questions' started by general23cmp, Aug 16, 2004.

  1. general23cmp

    general23cmp New Member

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    Simple question...Not having the two types of heads in fromt of me, what are the differences in the two types (design, specs, function, etc.)? I am totally in the dark here. I've been into Chevy's in the past.
     
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  2. DQUES

    DQUES Member

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    FAT HEAD 5'S HAVE A MUCH SMALLER COMBUSTION CHAMBER AND A LARGER VOLUME INTAKE PORT . THE TWO DESIGNS DO NOT SHARE ROCKER STANDS, MANIFOLDS , HEADERS, OR VALVE COVERS . THE FAT HEADS ARE MAINLY FOR ALCOHOL AND THE LARGER INTAKE PORT HELPS FILL THE CYLINDERS AT THE HIGHER RPM'S THE ALKY ENGINES TURN . THE SMALLER CHAMBERS IN THE 5'S ALLOW YOU TO RUN MUCH LESS TIMING ALSO . I HAVE SEEN SOME ALKY ENGINES USE FUEL HEADS WITH DECENT RESULTS .
     
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