I have a pair of new, still-on-crate GM ZZ 500/502 engines. I would like to sell one, or trade both for a single complete Mercury Racing 525 or a Volvo (Innovation) 600. I bought these 500/502 engines new from GM Powertrain Performance thinking they would go into a Scarab project I had. Then I sold the Scarab. These engines are intake-to-oil pan just as shipped, and still bolted to the crate base. Asking $6k each.