|
|
|
|
Original Message
|
| C6AE-R kept the large "pre-emission era" runners. |
| By Dave Shoe - 05/28/2001 2:29:13 PM; IP 216.243.158.45 |
There is nothing really special about the C6AE-R head (or the 428CJ head for that matter), as it's simply a large runner head like ALL 1965-earlier FE heads. The unique thing about the C6AE-R (and the CJ head) is that it also has the new-for-1966 unibody (i.e.: Fairlane/Mustang) exhaust manifold bosses cast into it (which may or may not be drilled, depending on which bodystyle it went into). This makes the C6AE-R head a convenient head for attaching ehaust manifolds or headers to in unibody cars (well, convenient compared to 1965-earlier heads which all lacked the unibody bosses).
The 428CJ head is nothing more than a C6AE-R head which has had the valve throats dressed out with a cutter so it can fit CJ-sized valves. Yup - the 427LR and 428CJ heads are cast as 2.03/1.55 valved heads and CUT to fit the larger CJ valves. Making the C6AE-R head perform like a CJ head is a trivial matter.
C6AE-R heads are sorta plentiful, having been installed on (I'm guessing) 25% (maybe higher?) of all 1966-1967 FE-powered cars and pickup trucks. Ford didn't just stick them in performance FEs - they seem to have used them randomly in ANY FE, without any consideration of performance status. These heads are a convenient way to make high-RPMs in larger displacement (390 CID+) in unibodied cars. A much more readily available choice for Galaxie and pickup truck owners is to use any 1965-earlier FE head, as these all have CJ sized runners and only lack the unibody bosses. If available, the unibody bosses are very convenient to use wqith headers in Galaxies and trucks, but aren't quite as necessary due to the slightly higher amount of underhood space available.
Thermactor bosses are another new-for-1966 feature cast into all FE heads (except 427MR and 427TP), but I won't go into this. Also, the C6AE-R head has an AR (anti-reversion) lip cast into it's roof at the outermost 1/2" of the exhaust runner, but that feature is easy to remove. Note also that emissions era "small runner" heads are probably the BEST performance head for 352-360 FE engines, as they apparently offer a better designed runner, but don't seem to flow as much at the top RPMs in larger displacement engines (this info is unverified - JMO).
The C6AE-R disappeared with the second wave of emissions legislation in 1968. Only performance FEs got large runners (and the now-mandatory for performance "Thermactor") from this time on.
As for proper mention of these heads in any FE publication - there is none. Anywhere. We sorta discovered all this info in these FE forums. I wrote SuperFord two dozen times on the subject of FE heads about five years ago, but they ignored my stories and never responded.
Shoe. |
|
|
This thread, so far...
|
|
|
|
Post A Response
|
|
|
|
|
|