Try www.gm.com/automotive/gmpowertrain (http://www.gm.com/automotive/gmpowertrain) best info on gm based engines with pictures too. May not have 502 on there as it has been discontinued. But a good site none the less. Hope this helps.
[This message has been edited by splasher (edited December 21, 2001).]
[This message has been edited by splasher (edited December 21, 2001).]