Series 60 oil pan gasket leaks

I removed my oil pan and when I put it back on with a new gasket, it leaks almost as bad as if there were no gasket. I had a black gasket before so I got the same one. The gray ones dont seem to fit right. I was careful to tighten the bolts from the center in a diagonal pattern gradually. I have done this twice now and I have no idea how it could leak in so many places around the pan . I used silicone on the seams front and back, but this is leaking all around. I prepped and cleaned everything super good so I would not have anything like this happen. I am not a newbie at working on engines, but I am no pro either. I let it idle for about 15 minutes and all looked good, so I drove for about 15 minutes and it started leaking. What could be wrong?

 

Mine has the fiberglass pan too. Were the cracks visible with the naked eye or did you need a magnifying glass to see them. I am getting alot of oil, and it had no leaks at all before I took it off.

 

How bad were your leaks? Were the cracks up under where the bolts push on the spacers ? Could you see them after the mechanic pointed them out? I think I will take a few of the bolts out and look under the rubber spacers with a magnifying glass. Maybe I cracked the pan when I tightened the bolts. The rubber spacers are there to prevent this. Maybe Rebel 127 will respond and help solve this.

 

It seems to be leaking all the way around as if the gasket isnt doing anything. Its hard to tell exactly because after I drive it, the wind pushes the oil around. I guess I will degrease the engine and idle the truck until I can be sure where the oil is leaking.

 

Where is a good place to get a new pan? Should I switch to a metal one? What should I expect to pay?