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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


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1960-1966
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1960-1974 GMC V6 & V12 Engine Data

GMC's Twin-Six V-12 Engine!

1960-1966 GMC's Inline 6 Engines

GMC Twin-Six V12 Engines

GMC Diesel Engine Data Page

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Powered by GMC V6/V12 Engines

GMC Transmission Data

Known Good Part Numbers

GMC Drive Axle Data

Spicer 5831 Aux Transmission

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