Knocking/Clicking Sound!
 

Okay guys, I own an 88 Supra turbo, and I recently had some head work done. It was torn down twice, due to a blown head gasket, and a mistake by the mechanic. The first time he released it to me, everything was fine, until it started overheating again. So I took it back.

He put the head gasket on wrong. So he re-did everything. I got it back, and it was fine! I started to notice a loud clicking sound when I accelerated. I looked at the engine and it isn't the fan clutch, nor any other fans(As far as I can tell). I got to looking closer, and I noticed the sound was coming from near the back of the engine, on the side where the turbo sits, close to the head. I checked the oil, and I put some in it(it was a little low) thinking it would fix the problem.

It's still freakin clicking! It's driving me nuts, because it's actually more noticeable than the sound of the car...and my car isn't quiet..AT ALL!

Does anybody know what could cause this?