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The most important thing in determining the "Safe" redline for any particular engine would be determined by the capability of the bottom end ,or reciprocating assembly. If a rod is going to go through the side of the block ot 5000 rpm then a safe limit would be 4000rpm or 4500rpm. There are a lot of factors that decide when a particular component will break.The rod ratio, here we go again, is very important in determining when the rod is likely to break or go through the side of the block.The larger the stroke the longer the rod needs to be. The pistons have to be a better quality the higher the revs. Also the balancing becomes more and more important as the revs get higher.The cam and heads, etc need to be chosen so that they work in the rev range that the bottom end can take!!
John
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