| Although I have ported the iron CJ castings and gotten good results the iron CJ exhaust port is just plain bad and turbulent as all hell even after porting. I haven't taken the time to document the porting as there has been little interest so far. |
| Iron CJ porting tips |
| Using the pics in the iron CJ index which have well worked exhaust passages to guide you. No matter how the iron cj exhaust is worked and it will flow over 200 cfm at .600" lift, the exhaust port architecture will cost you about 20 to 30 HP vs the aluminum CJ casting. This can not be eliminated. |
| Remove the little thermactor boss off of the guide and blend the bowl making it's diameter no larger than 1.475" Roll and radius the short turn just as in the iron D0VE section. It will help to tap and install a threaded plug in the drilled thermactor passage if it is drilled into the thermactor air rail. Do not make the passage any larger than it is already. Do not get to aggressive near the valve guide boss as water is close here. |
| The intake side is a no brainer and follows the same steps as the D0VE iron castings. The idea here is to gain flow by proper passage shape and short turn shape. Do not make the intake passage any larger. It is too damned big already especially for a 429. Blend the bowl and lay back the short turn radius. Streamline the guide if you wish but it is not necessary on a street terror. |
| The iron CJ castings were just made for big inch combos and high RPM 460 to 557 inch combo's This is where they really shine. If you can find a good set of aluminum CJ's I recommend it as they are reasonable in cost and easy to port. The iron CJ head has a bit better intake port too BTW. |
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