[jocko]

That interesting Brokenspoke, thanks for posting. I had never heard this before. I used the sbc input bushing and did not develop any vibration. May have been luck. But if I ever do it again, I might choose to use the newer metric pilot bushing.

Here's the more important question - is the T5 metric pilot bushing designed for a metric opening in the back of the crankshaft?? If so, I'd be more concerned with that fit (pilot bearing in the crank) than the fit of the pilot shaft into the pilot bearing. Don't want that pilot bushing to slip in the crank.

If, however, the opening in the end of the crank is the same between old sbc and newer vehicles (that came with an T5), then I agree, metric pilot bushing is probably a better idea. Thanks again - great info.