I'm in the process of swapping all the bolt on parts from my old 1996 5.7 sbc to a new long block. The plasitic timing chain cover has "Replace assembly if removed" molded right into the face of the cover. The gasket set that came with the new engine states that no gasket is provided for the timing chain cover because the cover must be replaced with a new one. What gives? The plastic cover came off the engine very easily. The rubber gasket looks perfect. The cover looks completely straight and true. No cracks or warps. The harmonic balancer seal looks perfect. Why does GM say you Must replace the assembly? What do you guys do?

-Kevin

1996 Chevy 1500 5.7L Vortec