Editing V12 engine (section)

== Usage in trucks ==
[[File:1960 GMC V12 702cid.JPG|thumb|1961 [[GMC V6 engine#702|GMC Twin Six]] engine]]

Several truck manufacturers have produced V12 diesel engines at various times. For example, the 1967–1982 [[Tatra T813]], built in Czechoslovakia, used a {{convert|17.6|L|cuin|0|abbr=on}} [[naturally aspirated]] V12 diesel engine, and the 1983–present [[Tatra T815]] is available with a {{convert|19.0|L|cuin|0|abbr=on}} V12 diesel engine in both naturally aspirated and turbocharged forms. In the United States, V12 versions of the 1938–1995 [[Detroit Diesel Series 71]], the 1967–1999 [[Detroit Diesel Series 149]] and the 1974–1995 [[Detroit Diesel Series 92]] were produced. In Japan, [[Isuzu]] produced naturally aspirated V12 diesel engines from {{convert|14.0|to|22.0|L|cuin|0|abbr=on}} in 1976–2000, for their heavy duty trucks: New Power, 810 and Giga.

Trucks using V12 gasoline (petrol) engines are rare, however several were produced in the United States from the 1930s until the 1970s. In 1931, ''American La France'' began producing firetrucks with V12 gasoline engines based on the ''Lycoming BB motor''. In 1935, the V12 engine used by the [[Pierce-Arrow Motor Car Company|Pierce Arrow]] luxury car was fitted to firetrucks built by Seagrave (with production continuing until 1970, since Seagrave purchased the equipment to manufacture the Pierce Arrow engines themselves). The 1960–1965 [[GMC V6 engine#702|GMC Twin Six]] {{convert|702|cuin|L|1|abbr=on|order=flip}} gasoline V12 engine was basically the ''GMC 351'' V6 engine, doubled, with four rocker covers and four exhaust manifolds.<ref>{{cite book|last=Mort |first=Norm |title=American Trucks of the 1960s|year=2010|publisher=Veloce |isbn=978-1-84584-228-4 |pages=41–44|url= https://books.google.com/books?id=lM_mr0ihODcC&q=GMC+twin+six+702&pg=PA42 |access-date=6 October 2010}}</ref> Peak power was only {{convert|250|hp|kW|0|abbr=on}}. However peak torque was {{convert|585|lbft|Nm|0|abbr=on|order=flip}}.
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