041 X heads
An ad elsewhere here shows a pair of 041 X heads for sale. Excuse my ignorance, but what is an 041 X casting? Is it like the 461 X head, where would the X be found? Did it have a different combustion chamber like the 461 X, or is the X located someplace else on the heads? Also, are they legal anywhere a regular 461 head is accepted? Inquiring minds want to know.
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