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Notched Rear Sump

Chevrolet big block notched rear sump oil pan by Moroso 20431.

This Moroso Chevy big block deep sump oil pan fits engine swaps into the 1962-1967 Chevy II without power steering and 1955-1957 Chevrolets.

Relocates the rear sump and improves oil control during hard acceleration.

Deep sump increases the capacity to 7 quarts, which reduces oil temperature and insures adequate supply to the pickup area.

Notched pan rails accepts strokes up to 4.250" with steel rods and 2.090" with aluminum rods.

Works with most starter and flywheel combinations.

Measures 9" deep with the sump measuring 6 1/4" front to rear and the front sump measures 7 1/4" deep.

Compatible with Moroso 32010 oil pan baffle.

Includes provisions to accept the Moroso dipstick kit 25970.

Recommend Moroso 24430 oil pump pickup tube for most oil pumps used. Scroll down the page for this pickup.

Moroso 20431Chevrolet big block notched rear sump oil pan Moroso-20431$239.97

Click to enlargeMr. Gasket 6086 Oil Pan Bolts for Moroso 20431 Oil Pan
MR. Gasket 6086 oil pan bolt kit.

Fits Chevy big block engines.

Works well with the Moroso 20431 oil pan.


Two 1/4 Inch 20 x 3/4 Inch Bolts.

Twenty 5/16 Inch - 18 x 3/4 Inch Bolts.

These oil pan bolt kits have a special smaller-than-standard hex head that is ideal for tight spaces.

Because of the hex flange head design, it will not back into the socket wrench, allowing for easier installation.

Special underhead serrations prevent loosening, and the wide flange head distributes uniform clamping pressure for an ultra gasket seal.

The Grade 5 bolts are zinc plated.

Click to enlargeFelpro 1893 Oil Pan Gasket for Moroso 20431 Oil Pan
Felpro 1893 oil pan gasket for Moroso 20431 oil pan.

Constructed of rubber with a steel core.

Fits 1965-1990 Gen 4 big block stroker engine.

Trimmed for rod clearance.

Click to enlargeMelling M77HV High Volume Oil Pump for Moroso 20431 Oil Pan
Melling M77HV high volume oil pump for Chevy big block engines.

Works well with the Moroso 20431 oil pan.

Approximately 25% higher oil volume than stock.

Standard oil pressure.

Uses press fit oil pump pickup tube.

TECH NOTE: Recommend Melling 24430 oil pump pickup tube for use with the Moroso 20431 oil pan.

Click to enlargeMoroso 24430 0il Pump Pickup For Use With Moroso 20431 Pan
Moroso 24430 oil pump pickup for use with Moroso 20431 Chevrolet big block oil pan.

Fits most popular oil pumps such as Moroso 22150, 22160, 22162 or Mellings M77 and M77HV pumps.

Moroso 23010 Oil Pan Baffle for Moroso 20431 Oil Pan
Moroso 23010 Chevy big block oil baffle for use with Moroso 20431 oil pan.

The Moroso big block oil baffle is designed to prevent sump oil from reaching the crankshaft during hard acceleration.

The Moroso oil baffle mounts between the rear main bearing cap and the oil pump.

TECH NOTE: Baffle will need to be trimmed to match the oil pan used.

Click to enlargeMoroso 25970 Dip Stick for Moroso 20431 Oil Pan
Moroso 25970 universal engine oil dipstick.

Designed for use with the Moroso 20431 oil pan.

Chrome plated with a built-in 1.4" NPT fitting.

A 1/4" NPT steel weld-in fitting is supplied for pans that do not already have that provision.

Existing "full" and "fill" dipstick marks can be used "as is" or new marks can be added to indicate desired oil level.

Tube and universal mounting tab can be bent or modified to accomodate engine compartment clearances and mounting locations.

A rubber capping seal keeps the dipstick secure in the tube and prevents crankcase gasses from escaping.

Overall length including exposed portion of the dipstick is 24".



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