351 to 460 exhaust manifolds?

351 to 460 exhaust manifolds?
what is the difference in exhaust port width between a 351 cleveland to a 460ci? can i streatch a manifold from a 351 to a 460?:whacked:

Center to center bore spacing on a 351C is 4.380". Center to center bore spacing on a Lima motor is 4.900". So, chances are pretty slim for making a 351C exhaust manifold bolt up to a 460.

thanks for the info,back to the drawing board then!