What to do?
The what now? This is the first I'm hearing of them. Got a link? Some info? How much?
I mis-spoke or forgot about one head to mention. First up;
The "A" engine replacement head. Based off the Magnum R/T head. My mistake here. It is a Magnum head drilled for the Comando (Older) intakes. It would be just like a Magnum conversion. I myself would skip it.
The head I forgot to mention, The Aluminum Comando cylinder head. (P4876785) Think upgrade from X head, better ports with a smaller chamber so you don't lose power because of the metal. The head will use everything on your current heads. No problem. It does state 2 cave eats. Different head bolts and minor mod to the rocker shafts. I do not know what this is.
The 3rd head, the Big Port Comando. Minor porting to this head out flows fully ported Edelbrock heads. The only cave eat that I see beside that it could really use some work to the chamber before you do anything is the use of W-2 rocker gear.
Also, all heads come bare. I spoke with Dick at Port Jeff Chrysler. He said to me he would sell me the heads @ 680 a head I think. Thats the only place I priced it at. He took a $100+ off the top of the heads list. (If not more)
Well, I've got well prepped, ported X heads. You're saying I won't see that much of a difference by going with the E heads?
Before I commit to a YES. And thats what I'd probably say sitting here knowing nothing about your heads and there prep/work. I'm more of a facts kind of guy. Scientist about matters. I'd want to know the facts on your actual head flow. You can look up Edelbrocks claims easy at there web site.
How do the match up?
How many cc's are in your X heads?
You said you milled them. With that, let me guess a milling to reduce head chamber from 70 - 72 to 65 cc's. That would be the same as the Edelbrocks.
Being aluminum, the heat loss is equal to 1 pt. of compresion. (losely)
Now on head flow. Dedcent porting, not crazy like, can get these "X" heads at the OTTB level of Edelbrock heads.
Edelbrock lists there S/B Chrysler heads flow as, @ .400 232/171 @ .400 , 249/183 @ .500, @ .600 @ 251/190, int./exh.
How does this compare to your heads?
That leaves you where?
With an infearior flowing head at a 1 pt. compresion loss. Now a 9.5-1 engine is acting like a 8.5-1 head or worse.
Now your back to milling and porting to achive a better level than the "X" heads.
Starting with the MoPar heads would be a better bet from where I sit, and in the long run it would be worth the expense. Othe heads to consider would be the Brodix or Indy(s)
Do not get me wrong about edel heads. Again, I own a set and like them for the street. Theres also guys running in the 10's with them, but with extensive porting. I also have not noticed anybody doing it with a 340 or 360 cid engine. But they could be out there.
