2004 Chevy venture cranks but will not start after changing timing chain and it has no compression at all

IF engine gets severely overheated - the piston rings loose their ‘tension’ and thus the ability to properly seal against the cylinder walls - resulting in little or no compression. ▪️ Cylinder *leak down* testing will provide the answer ▪️ Now what you should do is add a couple tablespoons of transmission fluid to each of the ‘accessible’ cylinders and re-test compression - then post the results here for additional help. Good luck!

See additional information posted above. IF no reply is posted - I can not help you fix this vehicle!

The timing was replaced because the chain was loose and the guide was broken and it has been over heating due to the person who had it before me putting the pully bell on the water pump backwards

All I can offer at this point is good luck!