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Hello
A 5R case is 2,4L and not the best start for a 2,7 RS.
Knifedgeing the crank will save power due the windage loses inside the engine and this power loss is relatet to the rev level.
On race engines some 8-10 HP can be gained by optimizing internal vent flow. Race engines also get a teflon coating on moving parts to make them "slipstreaming". Race pistons are very short and have sometimes only one ring made by busak & shamban. This is high $.
Grüsse
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