I was sorting through my assortment of old ram horn manifolds, and noticed that some of them are stamped GMT and some are stamped GM. As they look the same. What is the difference??
All are 2 " some are angled some center dump-
these in the photo are both angled back, one for each side that I was planning to use as a set on a 283 in the 64..
Any body have a " Chevy by the numbers book?" or any ideas ?
