LS4 Performance - need help fast!!

Well I am in the middle of installing my poly motor mount, And I cant get the stock one out. Is there an easy way to get this thing out?

U talking about the one on the core support

If you're talking about the one on the core support and don't plan to use the mount anymore you can cut the mount out. I used a hole saw and it worked pretty good.

The best way to save the mount is to use a screwdriver/pry bar and pry it away from the metal bracket enough to squirt some hand soap between it and the rubber all the way around the mount. Then use a prying fashion and work one side of the rubber out of the bracket and the rest will follow. Hand soap is an excellent lubricant for rubber.

I lubed up all 4 sides of it with wd-40, then used a big flat-head screwdriver and just pushed it out in one whole piece...

piece a cake...