Gary, I don't recall anyone posting the intake mod provided a dyno proven increase but remember a few spacers being added to show 10 or so HP gain. But mostly much bigger cams then the puny 212. The 413 and the poston 111 come to mind. Both much bigger than even the level 4. But I do agree that a dyno proven increase is what is needed to debunk this addon.
Not necessarily here, but elsewhere on the internet. I'll back off. I just wanted to offer up an explanation. Having dyno proven results on a Buick 350, and with different combinations, will tell the rest of the story I'm sure. Gary
