because the ls block is so cheap. you can throw about 6 ls blocks away before you have paid for a gs-r block. Also, you dont HAVE to have oil squirters. The only reason honda put oil squirters there is because over LONG periods of performance racing, like circuit racing, the pistons will overheat and melt. Forged pistons on the other hand will not melt at such a low heat and since you are gonna bump the compression anyhow, you should just buy forged pistons, esp. if you are running a ls block.