Hi all, So I've been told by alot of my fellow competitors that for our Street Stock class, 461x heads are what you want....nothing else. I bought a set of bare heads from a guy who said they are 461x heads, and showed them to a friend who happens to work on a pro top fuel car and knows his stuff. This friend says they are NOT 461x heads, they are regular 461 heads. The heads in question have the X stamped on the bottom of the water passage and nowhere else. My friend says if they were real 461x heads, the X would be stamped after the 461 on the bottom of the intake runners. I paid $500 for just the bare heads and he told me to get my money back. He told me that real 461x heads are super rare, and I probably won't even be able to find them. Information I've found on the internets is mixed....there are two heads on ebay right now that the sellers claim are 461x even though they are just like mine with the X under the water passage. Does anyone know for sure? I'm super confused! These heads are not even all that nice, with the side broken out of one head bolt hole and really bad seats and guides. My friend gave us a super nice set of 462 heads which he said will work better than the 76cc smogger junk I have on my race car now. Thanks!!!