I started by disassembling the old motor mounts from the Big Block then chucking them up in the vice.

With the plasma cutter I torched off the old mount so I could re-use the tube that the bushings fit in.

Next, I measured and plasma cut out a piece of 1/4″ plate to attach to the LS engine.

I found and printed off some templates from http://www.diyautotune.com/tech_articles/ls_central/ls_motor_mount_templates.htm The only thing I didn’t like about the template was how close the bolt holes were to the edge of the plate. So I left some extra steel top to bottom and extra steel width wise knowing I was going to have to extend forward to connect to my existing crossmember.

Take a Center Punch and make a mark for each of the 4 bolt holes then start drilling your holes.

Always step up in drill bit sizes from small to large. I have my press set on the slowest speed and use lots of cutting oil to keep from burning up my bits.

When drilling holes in two identical plates, I usually tack them together in 3-4 places with the welder so I can drill both at the same time.

The DIYAutoTune diagram spec’d out 9/16″ bolt holes which is what I used without looking at the bolts themselves first. In hindsight I probably would have made the bolt holes a size or two smaller.

Next I bolted the plates up to the motor and the assembled bushings into the crossmember. The next step is to attach the two with a piece of tubing. One side I coped with a hole saw and the other was cut off at an angle with the grinder. Tack it all together then carefully pull it out to final weld it.

I got a little excited and forgot to take pictures for a while. But basically I disassembled the bushing and final welded the tube and plate. Then I cut a gusset template out of some cardboard, cut it out of steel with the plasma, and final welded it on also.

After letting the paint dry, lube and reassemble the bushings.

And bolt back in! (using locktite on the threads to make sure they don’t loosen up over time)

Drivers side, same thing.