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Original Message
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| C8AE-H heads would have been original on a 428PI. |
| By Dave Shoe - 09/08/2002 11:08:14 AM; IP 67.4.132.71 |
If those thermactor-drilled C8AE-H heads have the 8-bolt vertical exhaust pattern, they are very likely to be PI heads from 1968-70. If they have a 14-bolt exhaust pattern they are likely to have come from a 1968 390GT engine in a Fairlane or Mustang.
The 8F19 marking on the block indicate it's an early enough block to get an aluminum intake, as the more cost-effective CJ cast iron intake replaced the aluminum on the 428PI soon after the CJ became available. It would ot have been too many weeks later that iron intakes would have replaced the aluminum on your engine. There are other identifiers which will help assure it's a 428PI/CJ/SCJ type block, but I won't go into them now.
C8AE-H heads with thermactor bosses drilled are not particularly common. They tend to be found on all 390GT cammed engines, and since the 390GT cam also came in the 1967-70 428PI and all 428CJ engines, it follows that these engines also got thermactor. The greater valve timing overlap of the GT cam apparently allowed some raw gasoline to pass directly from the intake valve right out the exhaust valve, thus requiring an exhaust gas reactor to clean things up. Note that in 1966-67 only California GT cammed engines needed thermactor, but the more stringent emissions laws of 1968 required GT cammed engines to run thermactor to
The C6TE heads are probably marine or industrial heads which likely came off 428 or 427 motors. These are the same as C6AE-R heads, and only need to have the "AR" lip ground off the exhaust port ceiling and seats cut and throat dressed to fit CJ sized valves installed to make them perform just like CJ heads. Note that CJ heads were cast for regular FE valves, but were throat dressed to fit the larger CJ valves. Also grinding the thermactor lump off the ceiling of the exhaust runner. Note the so-called "AR" lip is not really an anti-reversion lip, but I haven't yet figured out a handy nickname to describe it's real function of matching the early exhaust runner to the crappy 390 Fairlane/Mustang exhaust manifold, so AR will have to do for now. The nice thing about these heads over CJ heads is that you can likely cut them to "new" CJ valve seat specs, allowing the valve to sit tall for optimal breathing, rather than recessed in the head becuase of numerous valve grinds.
The 1U crank is correct for all 410, 428plain, 428PI, and early 428CJ engines. They are the same as later CJ and SCJ cranks, except they are drilled differently to achieve a different balance.
I believe there are two PI intakes, a C6 and a C7 casting number version. The best I can tell they are identical, and you have the latter. This is apparently the same as a 427MR intake, except the throttle linkage bosses are different.
The rods are standard 390/410/428/427, and were drilled for either 3/8" bolts or 13/32" bolts, depending on application.
Shoe. |
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