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I was talking with a local big time racer(a Mopar guy) and he told me I need to keep an eye on my cylinder bore. He said that it use to be with the KB blocks, that when you had a 4.500 bore, they had a hard time keeping them round if you were putting any kind of good HP to them. He wasn't sure if they got that problem figured out yet.
Has anyone heard the same thing? Has it been fixed yet? Or has anyone had that problem?
That depends on the OD of the sleeve, and it could be a problem with any aluminum block, not just KB. If you have a KB block, find the number on the oil pump mounting surface and call them. They can tell you everything about it.
^^^^^^^^^^THIS^^^^^^^^^^
As far as I know, ALL aluminum blocks move a bit. Some are horrible. That is one reason why you never hear a pro stock guy crying for an aluminum block (another is they don't want the front any lighter than it already is). CamasTC is correct. The thinner the liner, the worse it CAN be. Also, how the cylinder bore is designed/made has an effect. Had a block that we bored the cylinders out and ordered custom O.D. sleeves to try and correct it. Worked about 5-7 runs and they were out of round again. Aluminum grows faster with heat input than C.I. So as you run, the liners almost "float" in the bores. And then, as the block cools down, the aluminum tends to shrink more than the C.I. sleeves. And naturally, they don't shrink and grow the same every time. So you get cylinder bore distortion (sometime even 4th order) and there really is little you can do about it.
Just because you think it won't make it true. Horsepower is KING. To dispute this is stupid. C. Alston
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