they told me I would have to come to the county emission place every year to have it tested and that I could put a 5.7 ls1 in but not a 5.3 or 6.0 because the 97 never had those. I know strange but thats what they told me. Luckily I had a stroker lt1 I had blown up so I just rebuilt the vortec using the 383 crank and rods out of that motor. Should run really well with very little expense.

Shawn