future problems... buying another block can be risky sometimes, like i said above, you never know what kinda shape the other block is in, and there is no telling if the motor will blow in the near future, then its back to square one again... i would put new piston rings, new bearings, and get the crank turned. that way u know the motor is in good condition... sure you spend a lil more cash but it may be well worth it IMO. I think you would be taking more of a chance by buying another used block... that could possibly have been raced with and beat on. I had a d16 with about 200,000 miles on it... rebuilt it when i blew it... and i sold it to someone else... they have over 350,000 miles on it now and it still runs good with out any problems.

Unless you buy a motor that has already been fairly restored and has been takin good care of. And what is the odds you will find someone dumbe enough to sell a fresh rebuilt block for less than what it will cost to diy.... it could be real risky. just be careful with ur decision making.