From my experience the 3X is for a big HP big cube deal. Otherwise it is more plenum than smaller engines need. The 3X is pretty close to a B1 intake and treat it as such. It does not belong on a typical bracket motor especially if someone has done work to the plenum for sure. I have each ere for our drasgter

"I am not ashamed to confess I am ignorant of what I do not know."

"It's never wrong to do the right thing"