It depends on what parts of the motor your going to reuse really, to me 500 is too much for one your going to pull apart andrebuild anyways. You should be able to pick up a good usable block crank and head for around 300 if you do your shopping right. I put a good running 6bolt in my 2g for $200. Now granted I bought a whole 1g pulled the motor then sold the shell for $100 less than I payer for it