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One thing to think about is cylinder wall thickness. I was told by a veterean funny car racer that when he switched from 4.375 bore to 4.467 it did increase hp but he was haveing alot more trouble with rings staying sealed. The best he could find is that the wall thickness of the sleave was thinner and it was loosing it shape under load. Granted this was different aplication but the princial is still the same.




This is a new mega block.



I don't know what the average cylinder thickness is on a mega, but the above bores on a KB block are pushing the limit on a standard KB sleeve, even with a solid block behind them. KB does make an oversize sleeve which, I think is 4.700" outside diameter which will still give .100" thickness at 4.50" bore, adequate for a N/A combo but marginal on anything stronger. More than likely the funny car guy had the std. OD sleeves which is I think 4.610" or 4.625", leaving him only about .070-.085" sleeve thickness, which is probably why he was losing ring seal.



This actually a siamese mega block.