The reason I changed is because everyone I talked to said my Eagles SHOULD be ok. I dont like the word should. I would prefer to go overkill and not worry about it as much. It was alot cheaper to spend the cash now as opposed to building another motor because of one slip when tuning. Sad part is no matter what you do it can still blow up. I just want to do it right the first time and if it blows atleast I know that it was built as strong as possible and there wont be any second guessing as to whether it would have held together with better parts. I dont want to limit my motor to 600 even though I will probably never need any more than that.