
48" BBC with flat rear wall. In this pic you can clearly see the turbocharger and air cleaner on the frame rail. The small muffler is also clearly visible.



this is the engine underneath the truck body. Viewed from driver's side. Note the tiny muffler. Air cleaner is on frame rail behind engine. This is the naturally aspirated version of the engine.



As i get more info, I will share it. peterbilt experimented with one of these, but I don't think it ever made production.













