Let’s examine what type of intake manifold the 1962 413 Max Wedge (Maximum Performance) engine was produced with.
The 413 Max Wedge engine intake manifold is an aluminum cross ram design engineered to mount two 4-barrel carburetors diagonally across from each other. The intake runners are 15″ long and are tuned to increase engine horsepower above 4,000 rpm. The casting number is 2402726 and part number 2402332.
The cross ram manifold carburetor mounting areas are above longitudinal plenum chambers contained inside the manifold. From the plenum, the intake runners cross the engine to feed air and fuel to the cylinders of the opposite bank of the block.
An internal balance tube connects the two plenums, and the intake does not have any heat passages.
The manifold fits between the rocker covers and acts as a tappet chamber cover.
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413 Max Wedge Intake Manifold
The following table contains the short ram, or crossram, intake manifold specifications and numbers.
The specifications are identical for the Plymouth Super Stock 413 and the Dodge Ramcharger 413 engines.
|413 Max Wedge Intake Manifold
Super Stock 413/Ramcharger 413
|Short Cross Ram
|(2) 4-Barrel Carb
|Tuned to increase output in ranges above 4,000 rpm.
|30 ft. lbs.
Casting and Part Numbers
The casting number for the 413 Max Wedge engine is 2402726. It is located in the middle of the manifold on the raised, rectangular section. Typically, -1 follows the casting number.
This casting number remained the same for every Max Wedge manifold cast including the 426 engine.
Although the casting number remained the same, the part numbers did change.
The 1962 intake manifold part number is 2402332.
Additional part numbers:
- Core hole plug: 2121198
- Screw hole plug: 2129351
- Screw hole plug seal: 2128962
- Manifold gasket set: 2421363
If you are looking to purchase an original manifold or to check their prices out of curiosity, eBay always has a few for sale. Check them out here, Max Wedge intake manifold.
In addition, Jegs High Performance often sells aftermarket manifolds and Max Wedge parts like the manifold plugs. Check it out, Max Wedge intake manifolds and parts.
The 413 Max Wedge intake manifold did not have a date code. The later versions of this manifold, for the 426 Max Wedge, in 1963 and 1964 did have a date code in the middle of the manifold.
Manifold Venturi Holes
Each carburetor mount has four holes that match the Venturi size of the carburetor used. The 1962 Max Wedge carburetor had a smaller primary than the secondary. Therefore, two of the four holes in the manifold are smaller.
How to Identify a 413 Max Wedge Intake Manifold
There are three ways to identify a 413 Max Wedge intake manifold and tell it apart from a 1963 or 1964. It’s not the casting number because all three years of the Max Wedge used the same intake casting number.
A combination of the following is how to identify a 413 Max Wedge intake manifold:
- No casting date.
- Two of the four carburetor holes are smaller.
- The gap between the front and rear bolt access holes and the carburetor mount wall are not filled in.
That gap is a design integrity flaw discussed in the next section of this article.
Modifications to the manifolds over the years can create confusion about what version of the manifold is what. Some people have filled in the gap to avoid future integrity cracks, and others have enlarged the primary holes to match the later, larger carburetor.
There was a Chrysler technical service bulletin which provided instructions on how to increase the primary bore holes in the early manifolds like the 413.
413 Max Wedge Intake Manifold Design Integrity Flaw
The Max Wedge intake manifold has six access holes. The holes allow accessing to the intake manifold bolts. The threaded access holes are plugged.
Two of the access holes (driver’s side front access hole and the passenger side rear access hole) have a gap between the access hole outer wall and the carburetor mounting surface wall.
When those two holes were over tightened, a crack could form on the access hole outer wall. This integrity flaw was later corrected with a new casting. It was corrected by filling in the gap between the access outer wall and carb mounting wall.
The bridge (extra material) is a way to help identify the difference between a 1962 and early 1963 intake manifold.
Many times repairs were made to the 1962 manifolds to fix a crack and add support to the vulnerable area.
Read more Mopar engine intake manifold articles:
- 426 Hemi Intake Manifold
- The First Nascar Hemi Intake Manifold
- 426 Hemi Intake Manifold Torque Specs
If you have any questions about the 413 Max Wedge intake manifold, send us an email found specifically on our contact page.
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
- Plymouth Super Stock 413 Owner’s Manual
- Dodge Salesmen’s 413 Fact Booklet
- Plymouth Service Bulletin No. 62-78: 413 Cubic Inch Super Stock Engine (Maximum Performance)