I am looking to get a 6.0 short block for a motor build project. Any how the question is how do you determine a 5.3 iron short block and a 6.0 iron short block. I dont want to take the engine apart to measure anything because I am buying it off someone. Is there a casting number or something obvious to look for. I just dont want to get ripped off and end up buying a 5.3.

 

on the back of the motor by the rear main cover it will say 6.0

 

hey i have a 6.0 in my z28 and i cant get it to function right the timing is wrong and its kind of slugish i have a A4 trans mti air lid 80 mm throttle body ls1 intake msd wires 1.8 harlem sharp rockers z06 springs 317 heads ported extreme energy cam 218 218 550 lift 114 lsa hooker ceramic headers i hope you can help me out on how to make if function right. they told me that i need to put smaller heads so the compression can go up and a bigger cam too. i want to do more mods to it so please help me out.

 

When you bought yuor 6.0 did you check to see if you got the LQ4 or the LQ9. A bigger cam will give you more power top end but you may lose some bottom without having a higher CR. Did you get it dyno tuned or mail order.