Editing GMC V6 engine (section)

==Diesel V6==
The naturally aspirated GMC four-stroke diesel engines were added to the General Motors truck line for the 1965 model year. As introduced, the D351, D478, and DH478 all shared the same 17.5:1 compression ratio.<ref name=65-engr>{{cite web |url=https://xr793.com/wp-content/uploads/2020/12/1965-Chevrolet-Truck-Engineering.pdf |title=1965 Chevrolet Truck Engineering |date=September 1964 |publisher=Chevrolet Engineering, Product Information Department |access-date=7 June 2024}}</ref>{{rp|34}} Although they shared similar displacement, bore, and stroke dimensions with the gasoline engines, very few parts were the same.<ref name=DW-Allen>{{cite news |url=https://www.dieselworldmag.com/diesel-engines/toro-flow/ |title=Toro-Flow: The other GM diesel |first=Jim |last=Allen |date=September 23, 2018 |work=Diesel World |access-date=7 June 2024}}</ref>

===D351===
The D351 has a {{cvt|4.56|×|3.58|in}} bore and stroke with a total displacement of {{cvt|351.2|cuin|L|1}}. The cylinder block is a chromium-nickel iron alloy with a 60-degree design.<ref name=65-engr/>{{rp|34}} It has a peak gross and net power output of {{cvt|130|and|118|hp}} at 3200&nbsp;RPM, respectively, and corresponding gross and net torque output of {{cvt|234|and|223|lbft}} at 2000&nbsp;RPM, respectively.<ref name=65-engr/>{{rp|61}} It was discontinued for the 1967 model year.<ref>{{cite web |url=https://xr793.com/wp-content/uploads/2020/12/1967-Chevrolet-Truck-Engineering.pdf |title=1967 Chevrolet Truck Engineering |date=September 1966 |publisher=Chevrolet Motor Division, General Motors Corporation, Product Information Department |access-date=7 June 2024}}</ref>{{rp|48}}

===D478===
The D478 has a {{cvt|5.125|×|3.86|in}} bore and stroke with a total displacement of {{cvt|477.7|cuin|L|1}}. It may be regarded as a de-tuned DH478. The cylinder block is a chromium-nickel iron alloy with a 60-degree design.<ref name=65-engr/>{{rp|34}} It has a peak gross and net power output of {{cvt|150|and|135|hp}} at 3200&nbsp;RPM, respectively, and corresponding gross and net torque output of {{cvt|275|and|266|lbft}} at 2000&nbsp;RPM, respectively.<ref name=65-engr/>{{rp|61}}

===DH478===
The DH478 shares the same {{cvt|5.125|×|3.86|in}} bore and stroke as the D478 with a total displacement of {{cvt|477.7|cuin|L|1}}. The primary difference is the DH478 has an oil cooler standard, which is optional on the D478. The cylinder block is a chromium-nickel iron alloy with a 60-degree design.<ref name=65-engr/>{{rp|34}} It has a peak gross and net power output of {{cvt|170|and|155|hp}} at 3200&nbsp;RPM, respectively, and corresponding gross and net torque output of {{cvt|310|and|290|lbft}} at 2000&nbsp;RPM, respectively.<ref name=65-engr/>{{rp|61}}