Editing GMC V6 engine (section)

===401===
The {{convert|400.9|CID|L|1|adj=on}} '''401''' had a {{convert|4.875x3.58|in|mm|1|abbr=on}} bore and stroke.{{sfnp|Motor's|1973|pages=852-854}}<ref>gmc truck parts & illustration manual 1955-1964,1965-7</ref> It produced {{convert|210|hp|kW|0|abbr=on}} [[Horsepower#SAE gross power|gross]] at 3400 RPM and {{convert|377|lbft|Nm|0|abbr=on}} gross torque at 1400 RPM, while the Magnum version introduced in 1966 produced {{convert|237|hp|kW|0|abbr=on}} gross at 4000 RPM and {{convert|372|lbft|Nm|0|abbr=on}} gross torque at 1600 RPM.{{sfnp|Motor's|1973|pages=852-854}} The engine was a further enlargement of the {{convert|351|CID|L|1|adj=on}} '''351''' and was produced from 1960 through 1972. This engine was used in the 5500 and 6000 series as well as the H-5000; it was an option in the W-5000 and SP-5000.