66 GMC Long to Short LS Swap

[tinydb84]

You are running too hot or too slow. With thin stainless tube I weld from 1 o'clock to 11 o'clock (I am right handed). When you run 3 to 12 it is welding up hill and building heat.

Definitely want to back purge the weld. That will help. I bought a second tank and another regulator. It was a tiny bit more expensive but now I never run out of gas on a weekend (the dual flow regulators are expensive!).

I run a #7 cup most of the time. Get a thin filler rod. You cool the puddle by adding more rod and it will absorb more heat.

[Duncan K]

Skinny, Tiny, thanks for the input!

Welds are getting a little better, but they are still not shiny. I had a cheap Chinese gas lens that wasn't sealing to the torch and was letting air mix with the argon. Changed that out for a CK lens and things improved right away.

I have a second Argon tank so I ordered another flow meter so I can back purge. Also have a Furick Fupa 12 cup coming.

[Duncan K]

I finished welding the h pipe section and moved on to the back section. Got the mufflers mounted where I wanted them. Tried a few different pie cuts and bends to get clearance from the trailing arms. Everything is tacked up ready for finish welding once my flow meter and Furick Cup arrives. The slip fit on the Magnaflow mufflers is really crappy. The diameter of the inlets on the mufflers are too big so the fit is really sloppy. I cranked the clamps down but the mufflers still wobble. The gap is probably too big to weld up so I'm not sure how I am going to solve this



Still need to make a few hangers. Not sure if I am going to just dump the exhaust out past the axle or take it all the way out the back