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Original Message
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| For a lot of reasons. |
| By Gerry Proctor - 03/09/2006 6:15:36 AM; IP 137.242.1.15 |
C6AE heads with both horizontal and vertical bolt holes were originally installed in the Mustang or Fairlane. These are the 14-bolt heads. You'll notice that on the two inner exhaust ports, that there are no bolt holes at the bottom of the flange. Other passenger cars that used the same head casting number, like Galaxys, had only the 8-bolt vertical (bolt holes at the top and bottom of the port) pattern with no drilled and tapped horizontal holes. They are the same head with the exception of how the exhaust flange was drilled.
The only heads that came from the factory with the Cobra Jet 16-bolt pattern were the CJ heads (exception was the 427 head in the unibody cars). And the CJ exhaust flange bolt pattern is slightly different from the 14-bolt heads, beyond just having the two extra bolt holes for the inner bottom exhaust ports.
Ford had many port designs through the various evolutions of the FE head and it depended on what the engineering intentions were. And there is more to ports than just their size. A medium riser intake port used on the 427 is smaller in area than the standard passenger car port but the medium riser's port is higher relative to the valve short turn radius and has much better port flow. |
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This thread, so far...
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