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Or I've also heard pouring Coke in each cylinder and letting it sit for a couple of days will break a stuck motor loose. I've never tried it.
If its that hard to turn, it might be easier to pull the motor and install new bearings and rings before you do some serious damage.
Go to LS1tech.com and check there classifieds. They have 4.8, 5.3, 5.7 and 6.0 selling all the time at a reasonable price. thanks Chris
WHy not get a LS1. Save on weight and gas $. Fuel inject is the way to go. Plus it doesn't take much money to make it fast. Just me 2 cents.
I just registered with this forum and just want to say hello to everyone! Thanks Chris