![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiquNDa-3ys8HMozIxkCOLUcwgpyC638_imjmEO3sgWh_3_aN4f3OEHlsWDgV7aNtpza01bv1wNhFsHwbawPohy8rN5zN2Fy0pxzMLKiQtbZIBdoOvUTCu1HkAKS0VpFcDcZwi6bfPqHvc/s400/CFD+unit+127+h.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEiO62Y8YbQwdfFJx9jxatdPVIQApv_JPHYtF8QwcghiWjVzGbftYPDHhA5ii4WkB-KAKbsqJgzLtHVb1pDBLYuC1fbdstjylhiqWLy6SswuPNefguAjr8dzn0kFPcdSGHCQ2j1xdMTiS4k/s400/n577059732_362859_1613.jpg)
![](https://blogger.googleusercontent.com/img/b/R29vZ2xl/AVvXsEhxDtnSXXjEcOjykBazZOYO89s5IHvjbnYV7mWdAsdzAXNrEJO8wC_Hrvs8AJ6PbxbJFMTzN0lhsdHnOlk58q5tC4fiRgFWp_IJ5CAcAh0ZfHuU00_fCs3Tpqw2p1Qpq2SHsZ2ExsKnjJ4/s400/n577059732_291148_8264.jpg)
This is "12 truck", a classic open cab 1972 Pirsch, V-903 Cummins (dual straight pipe exhaust) and an early Allison Automatic transmission, that made that awesome V-8 Cummins slip just the least bit during shifting which resulted in that baby ROARING (it had solid lifters which resulted in people commenting that it sounded like it was "Cummins APART). Note the Federal Q-2 1hp motor driven siren, the loudest around.