Also golden eagle has great prices on sleeving blocks. check with camp1320.com ask for tom. I just got my block done a few weeks ago, it's looks sweet... camp1320 is also on hondatech.com a lot.

Stock sleeves are good for about 400whp or so (depending on turbo size) i've seen people push them over 500whp but IMO 400whp+ you should start looking into sleeves. 300whp is fine with stock sleeves and stock internals.