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Original Message
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| Stock heads are better. |
| By Dave Shoe - 04/10/2002 4:31:24 PM; IP 12.2.11.131 |
The port sizes are the same on both heads. The CJ also has thermactor restrictions in the exhaust, making the exhaust runner flow a little less.
Since both heads were cast for 2.02/1.55 valves and the CJ was machined at the factory to fit the larger valves, I'd recommend machining your C4AE-G heads for CJ-sized valves and dropping them in.
The only benefit the CJ head offers is when you need the extra eight ehaust bolt bosses to mount up headers or Fairlane/Mustang manifolds. 1966-later heads got these bosses.
The CJ ran better than the earlier FEs because it got a great intake manifold design from a concept developed in 1965. The FE head was designed correctly from the start. If you want to see good power in a mild performance motor, keep the stock heads and go with a MR/PI, CJ, or RPM intake.
Shoe. |
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This thread, so far...
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