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GMC Diesel Engines

GMC's TORO-FLOW V-6 DIESEL ENGINE

The GMC TORO-FLOW Diesel Engine, was basically the gas V6 engines converted to a Diesel. I have not heard vary many good reports about these engines. Most ended up replaced by a Gas powered V-6 or V-8. They also built a 637 V-8 Toro-Flow Diesel Engine.

Toro-Flow Engine Specifications

Engine Model	Gross Horsepower	Net Horsepower	Gross Torque lbs. ft.	Net Torque lbs. ft.	Bore - Stroke	Displacement	Compression	Notes
D351 V6	130 @ 3200 rpm	~ @ 3200 rpm	~ @ 2000 rpm	~ @ 2000 rpm	4.56" - 3.58"	351.2 cu. in.	17.5 to 1
D478 V6	150 @ 3200 rpm	135 @ 3200 rpm	275 @ 2000 rpm	266 @ 2000 rpm	5.125" - 3.86"	477.7 cu. in.	17.5 to 1
DH478 V6	170 @ 3200 rpm	155 @ 3200 rpm	310 @ 2000 rpm	298 @ 2000 rpm	5.125" - 3.86"	477.7 cu. in.	17.5 to 1
DT478 V6	220 @ 3200 rpm				5.125" - 3.86"	477.7 cu. in.	17.5 to 1	1
D637 V8	195 @ 2600 rpm	185 @ 2600 rpm	450 @ 1800 rpm	440 @ 1800 rpm	5.125" - 3.86"	637.0 cu. in.	17.5 to 1
DH637 V8	220 @ 2800 rpm	200 @ 2800 rpm	458 @ 2000 rpm	444 @ 2000 rpm	5.125" - 3.86"	637.0 cu. in.	17.5 to 1

1.
Twin Turbo Setup.

GM's 6V-71 DIESEL ENGINE

6V-71 DB-Model / 6V-71 DF-Model

The BEST DIESEL ENGINE ever built was the Detroit Diesel. Why GMC ever built the Toro-Flow when this engine was around is a mystery. Chevy use the Smaller 53 series in their trucks, but GMC when with the 71 series. The series number is the cid of each cylinder, so a 6V71 would have a displacement of 426 inches. These engine could take the abuse and that is why you seen them in City Buses, Garbage trucks, and Firetrucks.

Detroit Diesel Engine Specifications

Engine Model	Gross Horsepower	Net Horsepower	Gross Torque lbs. ft.	Net Torque lbs. ft.	Bore - Stroke	Displacement	Compression	Injectors
6V-53N	195 @ 2600 rpm	185 @ 2600 rpm	447 @ 1400 rpm	439 @ 1400 rpm	3.875" - 4.50"	318.4 cu. in.	18.7 to 1	~~
6-71NE or 6V-71NE	195 @ 1950 rpm	187 @ 1950 rpm	570 @ 1200 rpm	557 @ 1200 rpm	4.25" - 5.00"	425.6 cu. in.	18.7 to 1	N55
6-71N or 6V-71N	218 @ 2100 rpm	209 @ 2100 rpm	604 @ 1200 rpm	591 @ 1200 rpm	4.25" - 5.00"	425.6 cu. in.	18.7 to 1	N60
6-71N	238 @ 2100 rpm	229 @ 2100 rpm	650 @ 1200 rpm	636 @ 1200 rpm	4.25" - 5.00"	425.6 cu. in.	18.7 to 1	N65
8V71NE	260 @ 1950 rpm	249 @ 1950 rpm	761 @ 1200 rpm	731 @ 1200 rpm	4.25" - 5.00"	567.5 cu. in.	17.5 to 1	N55
8V71N	290 @ 2100 rpm	275 @ 2100 rpm	805 @ 1200 rpm	774 @ 1200 rpm	4.25" - 5.00"	567.5 cu. in.	17.5 to 1	N60

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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