413 Max Wedge Crankshaft: Main Journal and Bearing Sizes

The 413 Max Wedge crankshaft is made of forged steel and has a 3.750″ stroke. It is similar to the standard 413 crankshaft except it has hardened journals and shot peened fillets.

The main bearing journals are ground .0005″ under the standard shaft size. This was done for the following reasons:

  • To accommodate the F-77 Tri-Metal heavy duty bearings.
  • Provide additional clearances and a greater rate of oil flow between the journals and bearings.

The crank’s connecting rod journals were ground 0.001″ under the standard size for the same reasons.

The combination of the above makes the 413 crankshaft more durable, stronger and able to handle higher r.p.m.

This article will take a closer look at the Max Wedge crank and its specifications including the journal and bearing sizes.

413 Max Wedge crankshaft.
413 Max Wedge crankshaft

413 Max Wedge Crankshaft

The following table includes the specifications for the crankshaft, main bearings and clearances.

413 Max Wedge Crankshaft
Part No.2402330
Forging No.2206158
MaterialForged steel
Number of main bearings5
Main journal diameter2.7490″ to 2.7500″
Connecting rod journal diameter2.373″ to 2.374″
Thrust bearing#3
Clearance desired.0015″-.0040″
Maximum clearance allowable.005″
Maximum out of round permissible .001″
Interchangeable bearings1-2-4-5 (Lower)
2-4-5 (Upper)
End play.002″-.007″
Finish at rear seal surfaceDiagonal knurling
Crank pin diameter2.373 to 2.374″
Main bearing part No.No. 1: 1881778
No. 2,4,5: 2084805
No. 3: 1881782
413 Max Wedge engine crankshaft, bearing specifications and clearances as per Chrysler service bulletin dated December 14, 1962 No. 63-26.

The 413 Max Wedge crankshaft used a six bolt pattern on the rear flange. Also, the cranks I have seen have the part number punched in and not cast.

The 413 Max Wedge crankshaft part No. punched into the crank.
The 413 Max Wedge crankshaft part No punched into the crank

413 Max Wedge Main Bearing Journal Size

The main bearing journal size is the diameter of the main bearing journal on the crankshaft.

  • The 413 Max Wedge main bearing journal diameter is 2.7490″-2.7500″
  • The maximum allowable out-of-round is .001″

413 Max Wedge Main Bearing Clearance

The main bearing clearance refers to the space between the outside diameter of the crank journal and the inside diameter of the main bearing.

The space or clearance allows a cushion of oil between the journal and bearing.

413 Max Wedge main bearing clearance:

  • Clearance desired: .0015″-.0040″
  • Maximum clearance allowable before reconditioning: .005″

The clearances for the Max Wedge are greater (looser) than the standard 413 engine because the factory often recommends a looser clearance for race engines.

Checking the Main Bearing Clearance

Disclaimer: Some of the links in this article may be affiliate links. As an affiliate associate, I may earn a commission for qualifying purchases at no extra cost to you.

When checking the main bearing clearances on your 413 Max Wedge, two tools are required:

  • A dial bore gauge to measure the inside diameter of the main bearing.
  • A micrometer to measure the main bearing journals.

The main bearing journal diameter can be checked with a precision micrometer sized for the range of the journals you will measure.

There are many cheap micrometers out there for sale you should avoid. Use a quality micrometer that will measure down to the 0.0001-inch.

Also, the best dial bore gauges are accurate down to 0.0001-inch. The two tools can be purchased as a set offering measurements from the 2-4″ range.

Check out quality dial bore gauges and micrometers at Jegs High Performance, Dial Bore Gauges and Micrometers.

This video explains how to check main bearing clearance.

More Mopar Crankshaft and Main Bearing Articles:

If you have any questions about the 413 Max Wedge crankshaft, send us an email found specifically on our contact page or comment below.

About 38 years ago I assembled my first Mopar engine. It’s at that time my hands on experience with Mopar engines, including the Max Wedge, started. Although my research of the engines started years earlier.

Read More 413 Max Wedge Articles

413 Max Wedge Specs

413 Max Wedge Engine Redline (Max RPM)

Article Resources

  • Google Books: Chrysler Engines 1922-1998
  • 1962 Plymouth Super Stock 413 Owner’s Manual
  • 1962 Dodge Ramcharger 413 Booklet
  • Dodge Salesmen’s 413 Fact Booklet
  • Plymouth Service Bulletin No. 62-78: 413 Cubic Inch Super Stock Engine (Maximum Performance)

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