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Paul Precht · 08-23-2023, 02:07 PM

The 915 head is far better for stock, the 516 is an earlier head. A superseding head is typically if not always a newer head.

08-23-2023, 02:07 PM	#2
Paul Precht Senior Member Join Date: Dec 2001 Location: Elysburg, Pa Posts: 731 Likes: 353 Liked 310 Times in 119 Posts	Re: 1967 plymouth gtx 440 cylinder heads. The 915 head is far better for stock, the 516 is an earlier head. A superseding head is typically if not always a newer head.