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Paul Precht · 10-02-2022, 03:43 PM

The 906 can be milled to 915 spec and both heads have basically the same ports. You may have to mill the 906 more but not much. The 915 head requires a .0062 cut per CC and the 906 is .0042 per CC. There are currently some 67 Belvedere's running as GTXs in Stock.

10-02-2022, 03:43 PM	#2
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 732 Likes: 357 Liked 323 Times in 119 Posts	Re: 1967 belvedere claimed as a gtx. The 906 can be milled to 915 spec and both heads have basically the same ports. You may have to mill the 906 more but not much. The 915 head requires a .0062 cut per CC and the 906 is .0042 per CC. There are currently some 67 Belvedere's running as GTXs in Stock.