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Original Message
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| Same, but different. |
| By Dave Shoe - 11/22/2002 11:10:01 PM; IP 216.243.176.34 |
The FE head got it's only major redesign in 1966.
The goal was to reduce emissions, so emissions features found their way in. Additionally, 1966 marked the incorporation of the FE into the Fairlane/Comet. This restricted exhaust manifold bolt access, so all heads (except 427 race heads) got eight extra bosses cast into them to allow drilling and tapping for a diagonal bolts at the exhaust manifold.
Now, onto your question:
There were three versions of the full emissions FE head. The first, was a C6AE-J or C6AE-L, and it got modified intake and exhaust runners.
The second version was the C6AE-U and C7AE-A, which was the same except the chamber was shrunken slightly, taking on the CJ chamber shape, without the big valves.
The third version was the C8AE-H and D2TE-AA, which was the same as before but an even smaller, all new combustion chamber was incorporated. this smaller chamber creaded more "velocity" around the increasingly shrouded valves. This apparently improved mixing. THis design stuck around to the end, though the D2 version was made compatible with unleaded gasoline, and thus the exhaust valve seat was induction hardened to reduce wear.
A really early 1968 Mustang could get either. A later only the C8AE-H. Check the date code of the head and of the car. They should be withing three months of each other,
Shoe. |
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