5. A front oil fill tube is an important identifying component of an early manifold. To relocate the tube, the front of the Chevrolet Performance intake manifold had to be ground. A small mound was shaped from aluminum and welded to the manifold where the functional fill tube was to go. The fill tube was then pressed in place and welded. Other stampings were ground, labels removed, and contours were shaped to give the intake the appearance of a rougher casting.