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GMC 351cid V6 Engines

All rating are for first year engine was used, many got bumped up in Horsepower & Torque during their run.

Engine Model	Gross Horsepower	Net Horsepower	Gross Torque lbs. ft.	Net Torque lbs. ft.	Bore - Stroke	Displacement	Compression	Notes
351(C) V6	180 @ 3400 rpm	155 @ 3400 rpm	312 @ 1800-2000	288 @ 1400-1600	4.56 in. - 3.58 in.	351.2 cu. in. (5.7L)	7.50 to 1	7
351E V6	220 @ 4000 rpm	190 @ 3700 rpm	320 @ 1600 rpm	304 @ 1600 rpm	4.56 in. - 3.58 in.	351.2 cu. in. (5.7L)	7.50 to 1	11
351M V6	220 @ 4000 rpm	190 @ 3700 rpm	320 @ 1600 rpm	304 @ 1600 rpm	4.56 in. - 3.58 in.	351.2 cu. in. (5.7L)	7.50 to 1	12

Engine Application (Notes)
7. Used in series 5000 trucks. Optional in the 4000.
11. In 1966 the 351E was offered in Light series 1000-3500 trucks.
12. M = Magnum series engines introduced in 1966.

The GMC 351 Cubic Inch Displacement engine was introduced in 1960, some engines were Stamped just
351, others 351C. The 351C was built for use in Bigger trucks, It was standard in 5000 & bigger
series trucks, and an Option in 4000 series trucks. These are heard duty engines, the pistons
will have four rings, three compression and one oil. See the Engine Data Page for more info.

This GMC 351C V6 came from a 1963 GMC L-model Truck, It has the high mount water pump & fan mount on
the crankshaft. Also seen here are the I beam exhaust manifolds, & 2 quart oil filter.

This engine has a power steering setup & the Alternator in mounted low.

The 351E came out in 1966 & was used in light duty trucks. It included some improvements like a paper
air cleaner & Spin-on oil filter. It has a low mounted water pump & rounded exhaust manifolds.

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Information About GMC Truck Drive Trains

GMC Big Block V6	1960-1966 GMC Drive-Train Data Pages	GMC Twin-Six V12
1960-1974 GMC V6 Engines Page #1	1960-1974 GMC V6 & V12 Engine Data	GMC's Twin-Six V-12 Engine!
1960-1974 GMC V6 Engines Page #2	1960-1966 GMC's Inline 6 Engines	GMC Twin-Six V12 Engines
GMC Plaid Valve Covers	GMC Diesel Engine Data Page	GMC Twin-Six V12 Myths
GMC V6 Performance Upgrades	Carburator Data Page	1965 Article GMC Irrigation Engines
GMC 351 V6 Engines	GMC Toro-Flow Diesels	Powered by GMC V6/V12 Engines
GMC 401 Magnum V6 Engines	GMC Transmission Data	Known Good Part Numbers
GMC 478 V6 Engines	GMC Drive Axle Data	Spicer 5831 Aux Transmission

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