Okay ... now that I have been told that small blocks end up winding too high on heavier rigs ('79 K20 Suburban), I am thinking seriously about a big block swap. Does anyone have a clue where I can find any legal requirements for a swap of this type. Has anyone here run an HT502 or one of the other performance GM Crate Motors (ZZ502 or HO502) through the smog stations with repeated success? I may not go the crate route, but then again I might. I'm also interested in whether anyone has swapped in the newer GM 8.1 with computer and all into an older rig. I understand Advance Adapters has had some requests for this, but they are still not offering a new swap in assembly, so I guess I would be relegated to finding a wreck. On the techincal side, how do the mounting points for the big blocks change ... etc. Help a confused member out if you can .... /forums/images/graemlins/confused.gif. I'd sure appreciate it.