Intake porting/blending

yellow rose said

I’ve seen a dozen or so heads where the flattened the floor like that, tested 3 of them and never figured out what they were doing except chasing volume. Certainly didn’t hurt anything and I’ll be looking into it again when I do my W2 junk.

Don’t know if they hurt the manifold or not. If they did, it’s easily repairable.

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You likely see that’s the roof of the intake runners that are squared (flattened) I got it for free from an engine shop that couldn’t just dumpster it, I was just gonna pay it forward to someone else but decided to hang onto it, blast it clean, clean up the plenum runners as best possible when I finish up other stuff, and see what I end up with.