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[V6 Performance]
GMC 478 cid V6 Engines
All rating are for first year engine was used, many got bumped up in Horsepower & Torque during there run.
|
Engine Model
|
Gross Horsepower |
Net Horsepower |
Gross Torque lbs. ft. |
Net Torque lbs. ft. |
Bore – Stroke |
Displacement |
Compression |
Notes |
|
478 V6
|
235 @ 3200 rpm |
206 @ 3200 rpm |
440 @ 1400 rpm |
400 @ 1400 rpm |
5.125 in. – 3.86 in. |
477.7 cu. in. |
7.50 to 1 |
10 |
|
478M V6
|
254 @ 3700 rpm |
225 @ 3400 rpm |
442 @ 1400 rpm |
410 @ 1400 rpm |
5.125 in. – 3.86 in. |
477.7 cu. in. |
7.50 to 1 |
12 |
Engine Application (Notes)
10. In 1962 the 478 V6 was introduced for use in the 6500 series trucks.
12. M = Magnum series engines introduced in 1966.
The biggest V6 Engine GMC every built is the 478 cid V6. This one was a pump
engine set up to run on natural gas. It came from a Texas Farm.
This engine is just about complete & mounted on a stand.
This would make a great engine in a pickup or one ton, they came stock in the 6500 & bigger GMCs.
The 478 has 235 horsepower @ 3200 rpms, & can put out 440 ft. lbs. of torque @ 1400 rpms.
This engine has the standard round truck type flywheel housing & could be mated up
with a 13 speed trans or Allision automatic.
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Information About GMC Truck Drive Trains
 GMC Big Block V6 |
1960-1966 |
|
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© 2000-2009 6066 GMC Trucks. Last Updated August 1, 2009.