70 dart 470 ci drag car build.

In the context of what you are saying the B1BS was never ahead of the -1 Indy unported especially. They aren't a bad head but even 'all-out' they can't touch a similar prepped -1. Even though B1 original is a better head you'd rarely find one run better than a good -1 build.

I think the reason you are saying this is because there are so many 440-1 builds. My buddy runs 8.50’s with B1BS heads in his 69 charger. He finally bought a set of B1MC heads and our B1 guru and friend Tom Hemphill passed away.