Since there hasn't been a known cracked sleeve known to date I would say that you'll be fine upwards to 700whp and some. It's best practice sleeve the block at this power but honestly, it's been proven too many times that with a good tune, it will work for a little while.

 

I wish we had kept the stock s2000 engine program as I'm confident it would have ran low 9s on the stock engine.
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No better time than now to open it back up. Back when you guys where running high horse power and low times it had never been done on a stock block before. I don't know about the rest of the community but it breathed new life in the s2000 for me.

 

Thanks for the replies! i was planning to do a forged piston and rod build on my f20c. (malhe pistons wich are compatible with the frm sleeves). since i would be using arp head studs the weakest parts are the sleeves and the crank

 

Well u have a set of new in the box pauter x beam rods for sale for f20c just FYI

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