No warranty on mine. I ordered a new manifold as the manifold end where the bolts were broke was warped bad. I doubt I could of had in machined flat without taking off quite a bit.
318 Poly engines were famous for warping and breaking the driver's side manifold. If you find a Poly in a wrecking yard that still has a driver's side manifold on it, chances are it's cracked. Passenger side rarely cracked so lots of those around.
A seasoned but warped manifold machined flat again has pretty much done all the warping it's going to do and will usually live a long happy life with new hardware, assuming it can be machined back true. A new green casting is just asking for rinse repeat.
Kevin
