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Mike Taylor 3601 · 11-29-2013, 01:46 PM

Not sure about those heads off top of my head.I do remember that 461X had different cc runners. Should be able to look up in runner volumes on NHRA.com.
I don't think you can use the X castings unless it is listed in your casting # on engine specs.
Mike Taylor 3601

11-29-2013, 01:46 PM	#2
Mike Taylor 3601 VIP Member Join Date: Oct 2008 Location: Somerset,Ky Posts: 1,372 Likes: 354 Liked 307 Times in 103 Posts	Re: 487 vs. 487x heads Not sure about those heads off top of my head.I do remember that 461X had different cc runners. Should be able to look up in runner volumes on NHRA.com. I don't think you can use the X castings unless it is listed in your casting # on engine specs. Mike Taylor 3601