I was rebuilding my 87 turbo block got it all cleaned up and ready to rebuilt. I was going to re-use my 90 ge pistons. The problem arose when I was mocking everything up just to make sure it all fit. I tried to dry fit the an pistons in the turbo block and an unringed piston would not fit in the cylinder. My ge motor was rebuilt by Toyota could it have bored out or did Toyota increase the cylind size between 87 and 90?