1967 belvedere claimed as a gtx.

Paul Precht · 10-02-2022, 09:33 PM

A 915 head never milled is frequently about 84 CCs, theoretically a .062" cut would bring it to 74CCs. A 906 head never milled is frequently about 88 CCs, theoretically a .058" cut would bring it to 74 CCs so your valve to piston clearance would be similar but could go either way depending on the casting. A nice set of 915 heads will cost 500 and up, 906 heads are like grass, they are everywhere and can be had for nothing sometimes.

10-02-2022, 09:33 PM	#9
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 732 Likes: 358 Liked 326 Times in 120 Posts	Re: 1967 belvedere claimed as a gtx. A 915 head never milled is frequently about 84 CCs, theoretically a .062" cut would bring it to 74CCs. A 906 head never milled is frequently about 88 CCs, theoretically a .058" cut would bring it to 74 CCs so your valve to piston clearance would be similar but could go either way depending on the casting. A nice set of 915 heads will cost 500 and up, 906 heads are like grass, they are everywhere and can be had for nothing sometimes.