Note the gap at the top of the intake port and the bolt holes above the manifold mounting surface View media item 32352Pic: Intake sitting with TBI head on the left, Vortec head on the right. If you're sane, you'll want a Vortec-specific intake. Some people have proposed welding to build up the top outer edge of the TBI port and then porting the inside to match the Vortec port, but that's a lot of welding on an aluminum intake. The Vortec intake manifold has taller ports, and the TBI manifold doesn't cover the openings. View media item 32351Pic: Note the differences in bolt holes. The Vortec intake bolts are significantly smaller, and you'll be putting them in shear as well as tension. You might get away with using the Vortec mounting holes to "clamp" the outer edge of the TBI intake, but I'm not stupid or desperate enough to do it. You would need to drill and tap holes to physically mount a TBI manifold to Vortec heads, and that doesn't fix the problem of covering the intake ports. The Vortec manifold has eight bolts, two on each corner, drilled vertically, higher on the head, versus the TBI intake that has two in each corner, drilled perpendicular to the mounting surface, and an additional two in the middle of each side. Yes, you can swap a Vortec motor in place of a TBI motor, but no, it doesn't bolt in place. "Can I swap a Vortec motor in place of my TBI motor and does it just bolt in place?"
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