When my engine took a turn for the worst, I called APE, but they had no used S engines. I asked about L engines and they said about $2500 - $4000 with around 100k. I'm not bashing them or anything, but I just couldn't afford that not to mention to make it S spec, it would cost a lot more. I found an already rebuilt S spec block on ebay for a pretty decent price. Now, to find some cores that are hopefully local...