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JRyan · 11-29-2013, 02:43 PM

The difference is that 487X heads have induction hardned seats and rotators from the factory. The 487's simply have a non-hardened seat and normal retainer.

Jerry

11-29-2013, 02:43 PM	#3
JRyan Senior Member Join Date: Apr 2003 Location: Aberdeen SD Posts: 645 Likes: 30 Liked 112 Times in 31 Posts	Re: 487 vs. 487x heads The difference is that 487X heads have induction hardned seats and rotators from the factory. The 487's simply have a non-hardened seat and normal retainer. Jerry