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GMC V6 engine
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==Gasoline V6== ===305=== The {{convert|304.6|CID|L|1|adj=on}} '''305''' had a {{convert|4.25x3.58|in|mm|abbr=on}} bore and stroke.<ref>{{cite book |ref={{harvid|Motor's|1973}}|title=Motor's Truck and Diesel Repair Manual|publisher=Motor|year=1973|isbn=0-910992-16-9|edition=26|pages=852β854}}<!--General Engine Specifications table - doesn't have disp, I'm AGFing the math--></ref> The 305A was equipped with a single barrel carburetor and produced {{convert|150|hp|0|abbr=on}} [[Horsepower#SAE gross power|gross]] at 3600 RPM and {{convert|260|lbft|0|abbr=on}} gross at 1600 RPM (measured without air cleaner or accessories in an ideal environment). <!--AGF A-->The 305E was equipped with a two barrel carburetor and produced {{convert|170|hp|0|abbr=on}} [[Horsepower#SAE gross power|gross]] at 4000 RPM and {{convert|263|lbft|0|abbr=on}} gross at 1600 RPM in 1969.{{sfnp|Motor's|1973|pages=852-854}} The 305 was GMC's standard [[Chevrolet C/K|pickup truck]] and [[GMC Suburban|Suburban]] engine from 1960 to 1969. The 305A was standard in 1000β3500 series trucks in 1960β1961 and was dropped in 1962. The 305D was an option in the 1000β3500 series in 1961 and became standard in 1962, replacing the 305A. The 305E replaced the 305D in the 1000β3500 series trucks in 1963 and was used until 1969. The 305B and 305C (a 305B with a different manifold and carburetor) were used in 4000 and 5000 series trucks; the 305B was dropped in 1962 while the 305C continued to 1974.{{sfnp|Motor's|1973|pages=848-849}}<!--model and engine table only refs 1962-1973--> ===351=== The {{convert|351|CID|L|1|adj=on}} '''351''' had a {{cvt|4.56x3.58|in|mm|1}} bore and stroke.{{sfnp|Motor's|1973|pages=852-854}} The 351C produced {{convert|195|hp|0|abbr=on}} [[Horsepower#SAE gross power|gross]] at 3600 RPM and {{convert|314|lbft|0|abbr=on}} gross at 1600 RPM, while the 351M produced {{convert|254|hp|0|abbr=on}} gross at 3700 RPM and {{convert|442|lbft|0|abbr=on}} gross at 1400 RPM in 1969.{{sfnp|Motor's|1973|pages=852-854}} Introduced in 1960, the 351 was available as a C series, an E series (351E), and Magnum series (351M). The E and M series featured a larger two-barrel carburetor and an open port intake, bigger intake and exhaust ports, larger diameter valves, and larger exhaust manifolds. The 351E did not use the same parts as the 305E.{{clarify|Fragment?|date=January 2023}} The 351 or 351C were used in some 4000, 5000, and 6000 series trucks from 1962 to 1972 and the 351E was used in the 1000β3500 series trucks from 1966 to 1969.{{sfnp|Motor's|1973|pages=848-849}}<!--AGF E--> The 351, 351C, and 351M engines were medium duty truck engines, while the 351E was a light-duty engine β basically a 351M without the oil-driven governors. In 1973, the 351 was replaced by the 379-cubic-inch V6.{{sfnp|Motor's|1973|page=854}}<!--351 to 379--> ===379=== The {{convert|378.6|CID|L|1|adj=on}} '''379''' had a {{convert|4.56x3.86|in|mm|abbr=on}} bore and stroke.<ref>{{cite book |ref={{harvid|Steel Tilt Cab Models|1972}} |url=https://www.xr793.com/wp-content/uploads/2021/11/1973-GMC-Tilt-Cab.pdf|title=GMC 72" Steel Tilt Cab Models (Brochure)|year=1972|publisher=GMC Truck & Coach Division|page=3|access-date=January 15, 2023}}</ref> It produced {{convert|170|hp|kW|0|abbr=on}} net at 3600 RPM and {{convert|277|lbft|Nm|0|abbr=on}} net torque at 1600 RPM.{{sfnp|Steel Tilt Cab Models|1972|page=3}} The 379 was a 351 with a 478 crankshaft. ===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. ===432=== The {{convert|432.3|CID|L|1|adj=on}} '''432''' had a {{convert|4.875x3.86|in|mm|abbr=on}} bore and stroke.{{sfnp|Motor's|1973|page=854}} In 1973 and 1974,<!--Motor's only refs 1973--> it produced {{convert|190|hp|kW|0|abbr=on}} net at 3200 RPM and {{convert|331|lbft|Nm|0|abbr=on}} net torque at 1600 RPM in 1973.{{sfnp|Motor's|1973|page=854}} There was also a version with enlarged crankshaft journals. The 432 was a 401 with a 478 crankshaft. The 432 was a Magnum engine, though it was never designated as such. ===478=== The {{convert|477.7|CID|L|1|adj=on}} '''478''' had a {{convert|5.125x3.86|in|mm|abbr=on}} bore and stroke.{{sfnp|Motor's|1973|page=852}} It produced {{convert|192|hp|kW|0|abbr=on}} net at 3200 RPM and {{convert|371|lbft|Nm|0|abbr=on}} net at 1400 RPM.{{sfnp|Motor's|1973|page=852}} It was one of the largest V6 engines ever built. It was introduced in 1962 for the 6500 series trucks.
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