Melling 10778 oil pump for the 1990-1993 Chevrolet C1500 V8 7.4L and other vehicles moves 25% more oil volume than a standard oil pump. It is a high volume, high pressure gear pump and a performance upgrade for the 10770.
- High volume gear pump with 25% more volume than a standard oil pump
- Higher-pressure relief spring installed, with a standard-pressure spring supplied
- Extended drive and idler shafts supported in the cover to eliminate dynamic shaft deflection at increased RPM
- Billet steel spur gears
- Cover doweled to the pump housing to keep the shaft bores aligned
- CNC machined housing and cover with a phosphate coating
Quick facts
- Part: Melling 10778 oil pump
- Also called: engine oil pump
- Fits: 1990-1993 Chevrolet C1500 V8 7.4L and other vehicles
- Material: Cast iron housing and cover, billet steel gears, chromoly steel shaft
- Condition: New
Low oil pressure, a pressure warning light or noise from the pump can mean the pump is worn, though worn engine bearings or a restricted pickup screen can be behind them as well, so find the cause first.
Fits
Made for the GM BBC, this oil pump is listed for a wide range of Chevrolet and GMC models, including the 1965-1969 Chevrolet Impala V8 6.5L and the 1973-1975 Chevrolet Malibu V8 7.4L. If your car isn't named here, find its year, model and engine in the "Vehicles it fits" section.
Specifications
Fit and size
- Quantity per vehicle: 1
- Pickup tube diameter: 19 mm (0.750 in)
- Inlet size: 19 mm (0.750 in)
- Mounting holes: 2, 6 mm (0.240 in) diameter
- Pickup screen fitting: 3/4 press in
- Height: 134 mm (5.250 in); width: 94 mm (3.700 in)
Build and materials
- Type: gear pump, spur gears, high volume, high pressure
- Manufactured pressure: 70 PSI (pink); optional spring pressure: 52 PSI (plain)
- Housing and cover: cast iron
- Housing finish: phosphate coating
- Gears: billet steel
- Shaft: chromoly steel
- Condition: New
- Country of origin: United States
In the box
One oil pump with its cover, gears, drive shaft, the 12770 intermediate shaft with steel guide, and both relief springs. This listing holds one pump, and the 1990-1993 Chevrolet C1500 V8 7.4L takes one. The pickup screen, gaskets or seals, bolts and other hardware are not included, so plan on new bolts.
Interchange: DM-77HVP
Frequently Asked Questions
Is this the oil pump for a 1973-1975 Chevy Malibu V8 7.4L?
Yes. Melling 10778 is listed for the 1973-1975 Chevrolet Malibu V8 7.4L, and that Malibu takes one pump. For other years and engines, look in the "Vehicles it fits" section.
Does this Melling high pressure oil pump come with a standard-pressure spring?
Yes. Melling 10778 has the higher-pressure relief spring installed and also includes an optional standard-pressure spring, which reduces bypass pressure if needed.
Does this engine oil pump include the pickup screen?
No. The pickup screen, gaskets or seals, bolts and hardware are not included. The pump comes with its cover, gears, drive shaft, 12770 intermediate shaft with steel guide and both springs.
How much more oil does the Melling high volume oil pump move than a stock pump?
This pump gives 25% more volume than a standard oil pump. It is a high volume performance upgrade for the 10770.
Is this Melling BBC oil pump tested for pressure and flow?
Yes. Every Melling high performance oil pump is individually tested for pressure and flow under actual engine operating conditions. Melling 10778 is made for the GM BBC.
