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Original Message
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| RE: cyl heads |
| By Gerry Proctor - 12/18/2003 1:47:13 PM; IP 207.133.188.254 |
No, Russ, Edelbrock is just the most AVAILABLE FE aluminum head. Dove also makes FE heads but whether you can get them is another question. There is also the option of using factory 428 CJ heads.
You have many issues in the balance. First, due to their thermal efficiency, aluminum heads pull heat more easily out of the combustion chamber. This has two effects: 1) They are less detonation prone than iron heads using the same compression ratio, and; 2) The produce less power than iron heads with the same compression since the heat energy that could be used to push down on the piston is being transferred to the coolant.
So, theoretically, you'd be looking at a horsepower loss with the slight reduction in compression and the loss of heat energy with aluminum.
But it's not quite that simple -and it never is. What you loose in thermal energy from both the compression and material you gain in airflow. Power is always in the heads and the Edelbrocks are far superior to the factory iron 390 heads. And the power gain is pretty much across the rpm range. The engine won't make power beyond where it does right now, as in increasing your redline, but they will punch it up -particularly in the midrange.
Hookers do fit the Edelbrocks quite well as they are the 16-bolt Cobra Jet flange pattern and port location. If you keep your factory C6AE-R heads, then you'll want to look to the FPA headers. |
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