X-heads vs J-heads: what's the difference??

RustyRatRod said

I cannot believe this is 4 pages of argument about 40 year old junk that everybody already knows all the answers to.

Click to expand...

One mans junk is apparently another mans treasure...LOL

http://www.ebay.com/sch/i.html?_odk...045573.m570.l1313&_nkw=mopar+heads+j&_sacat=0

disclaimer below...LOL

not trying to offend anyone if one of these is yours for sale...lol