Stan is right. I love Pontiacs just as much as anyone here but I build both BBC and Pontiacs and I can tell you it's much easier, and cheaper, to make power with the BBC's. Especially if you are going to use all production parts.
Get into all the aftermarket stuff and it starts to become a more even playing field thanks to some companies stepping up to the plate for Pontiac, but even with that the BBC just has a more superior head design to start with.
You can bench race it all you want and talk about could have or would have, lol. It makes an entertaining discussion but at the end of the day it's not what I'm seeing on the dyno or at the track.
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2019 Pontiac Heaven class winner
https://youtu.be/XqEydRRRwqE
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