You plan on FI since you re-installed exhaust manifolds? And does the engine sound like a sewing machine?

 

I'm not planning on FI but yes it does sound like a sewing machine.

 

my engine pretty much sounds the same to me since i installed my shorties.

 

Just a few suggestions... make sure that you dont have an exhaust leak retorque your bolts or at least inspect them to make sure they are not loose. And did you use the stock wires? Because two of them will touch the headers on the second cylinder back on both sides; make sure they are not melted and you are not hearing fire jump. Exhaust leaks and fire jumping could be mistaken for lifter/valvetrain noise. Other than that i dont know. I know its annoying but i wouldnt really worry about it unless it gets pretty loud. Just drive it and be happy. These engines are put together pretty sloppy from the factory for some reason which should give you a nice warm feeling inside. Mine has pretty audible piston slap until the engine heats up which is pretty common but not normal. Im gonna drive it until it wont go anymore and then build it.