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Does anyone have any experience with building a custom engine?

My s60 2.4t has spun a bearing and seized the engine so i want to build one

My plan is to get a 2002-2005 b5204t4 and install:

Forged 143mm rods

93.2mm crank from a d5

Je custom pistons 

Shim the block

This would give a 2401cc engine 

Im just wondering if anyone knows if a shimmed 81mm bore engine can make it past 400 hp? Ill be running a hybrid k24 turbo and performance cams with vvt delete and retard them 3 degrees to give more top end. Ive also not really heard of people pushing the revs on white blocks, id like to get mine to 8000 rpm, is that realistically possible? 

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I have always had other people do the build, but none of the ones I have used in the past are doing it anymore.

8000 RPM is possible and people have done it.  I had a tune that limited at 7200 and it happily went there all the time.

 

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