I had to "upgrade" my intake manifold to fit into my bike frame, and I was wondering if it would affect the performance of my bike... I had to make it shorter, and from aluminum. I drilled the inner diameter to 21/32", which is a little larger than the hole in the gasket. Does anyone have any ideas or suggestions? the whole manifold from gasket to end that is in carb. is about 1.25" long. very short.