As far as aftermarket parts - I agree it sucks. The fabricator that finished welding my oil pan is will to build headers for the 4200 if he can get 15 committed orders. Mild steel or stainless. 6:1 straight tube or stepped pipe, or, 2 x 3:1 >> 2:1...
With enough demand the parts will follow. Just got to relieve the engine of its orginal home....
51 GMC 4.2 turbo Can't solved today's problems using the same technology/thinking that created them
