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HP HUNTER · 11-30-2019, 09:36 PM

A 461 X casting is a completely different port when compared to a 461 port.
A friend of mine just did a set of 461 X heads, with a 2.020 valve with just cutter work and rolling the short turn the head flowed 233 CFM, a 461 with the same work will never see that kind of flow.

11-30-2019, 09:36 PM	#5
HP HUNTER Senior Member Join Date: Feb 2012 Location: Colorado Springs Colorado/Thousand Oaks Ca Posts: 656 Likes: 82 Liked 372 Times in 129 Posts	Re: 1966 327/275 cyl head cc A 461 X casting is a completely different port when compared to a 461 port. A friend of mine just did a set of 461 X heads, with a 2.020 valve with just cutter work and rolling the short turn the head flowed 233 CFM, a 461 with the same work will never see that kind of flow.