David Vizard, Uncle Tony's garage, Unity motorsport. Mission impossible Dodge 302 Head porting

Hysteric said

All this talk of truck and passenger car engines is funny. Chrysler Australia took a "truck engine" that was designed in the US but not used because they needed a replacement for the slant 6. They needed a performance version so they sent one to Italy to have the Italians design the induction system and stuck it in a short wheel base A body and ran 14.1's in the quarter in the early 70's with a 265 ci inline 6. Not bad for a "truck engine"

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Not really. The Aussie "Hemi" (barely) I-6 was a full clean-sheet design engineered mostly by Chrysler Australia for passenger cars. Chrysler USA considered using a 265 stroked to 300+ ci as a truck engine but the market was too small to justify the cost of bringing it here. This is straight from "Chrysler Engines 1922-1998" written by Willem Weertman. I think they did get some consultation from Weber in Italy for designing the top-level performance version of the Hemi 6 with the triple side-drafts.

You can take a truck engine and make it reasonably powerful but it's a lot harder to take a pass car engine and modify it to make more low-end torque. Not to mention until the 1980s or so there was hardly any difference between car and truck engines from U.S. automakers.