The Difference Between a 413 and 413 Max Wedge Mopar Engines

Many people wonder about the differences between a 413 and a 413 Max Wedge.

A 413 Max Wedge engine was made for competitive racing while the standard 413 was produced for passenger vehicles. Although based on the same engine block design, the Max Wedge has more horsepower, higher lift cam, shorter cross ram intake manifold, higher flow cylinder heads, exhaust valves and exhaust manifolds.

The Max Wedge requires racing fuel while the standard 413 can use pump gasoline. This is due to the higher compression ratio of the Max Wedge. The 413 Max Wedge also has stronger internal components for durability and higher r.p.m.s.

This article will examine the differences between the two engines in more detail.

413 Wedge engine on the left and a 413 Max Wedge engine on the right.
413 Wedge engine on the left and a 413 Max Wedge engine on the right

The Difference Between a 413 and 413 Max Wedge Engines

While both engines share the same engine block design there is many differences between the two Mopar engines.

The following table contains what is different between the Max Wedge and standard engines.

413 Standard413 Max Wedge
Production Years1959-19651962
Block Casting No.21205291852029
Cylinder bore notches at topNoYes
Cylinder head portsStandard25% larger
Cylinder head heat cross-overYesNone
Intake valves2.08″2.08″
(More streamlined)
Exhaust valves1.60″1.88″
Valve springsSingle (16)Dual (32)
Valve stem sealsYesNone
Camshaft.389″-.430″ lift
252°-268° duration
.509″ lift
300° duration
TappetsMechanical or hydraulicMechanical
Compression ratio10.0:1 or 10.1:111.0:1 or 13.5:1
Intake Manifold2 x 4-barrel long cross ram
2 x 4-barrel tandem
Single 4-barrel
2 x 4-barrel short cross ram
CarburetorTwo 4-barrels
Single 4-barrel
Two 4-barrels
Horsepower340-380 HP410-420 HP
Torque450-470 Ft. Lbs.460-470 Ft. Lbs.
Oil capacity4 qt. oil pan
Plus 1 qt. for oil filter
5 qt. oil pan
Plus 1 qt. for oil filter
CrankshaftForged steel413 Crank with hardened journals & shot peened fillets.
Connecting RodsDropped forged “I” Beam413 rods but specially selected for quality.
PulleysStandard size and groovesSmaller crankshaft pulley and deeper grooves on all pulleys.
Exhaust manifoldsStandard manifoldsHigher air flow and larger outlets.
The different specifications between a 413 and 413 Max Wedge engines.

Production Years

The 413 Max Wedge was only produced for one year, 1962. The 413 engine was produced for seven years, 1959-1965.

413 and 413 Max Wedge Engine and Components: Differences

As stated earlier, both engines used the same block design, although there are some differences.

Horsepower and Torque

The Max Wedge engine has more horsepower than any year of production for the 413. Some of the passenger 413 engines had the same or more torque due to its longer branch manifold.

The following are the horsepower and torque ratings for the Max Wedge and Wedge engines:

1962 413 Max Wedge:

  • 410 HP @ 5,200 rpm (11.0:1 C.R.)
  • 460 Ft. Lbs. @ 4,400 rpm (11.0:1 C.R.)
  • 420 HP @ 5,200 rpm (13.5:1 C.R.)
  • 470 Ft. Lbs. @ 4,400 rpm (13.5:1 C.R.)

1959 413 Wedge Engine (4-barrel):

  • 350 HP @ 4,600 rpm
  • 470 Ft. Lbs. @ 2,800 rpm

1959 413 Wedge Engine (Tandem 4- barrels)

  • 380 HP @ 5,000 rpm
  • 450 Ft. Lbs. @3,600 rpm

1960 413 Wedge Engine (2×4-barrel long cross ram):

  • 375 HP @ 5,000 rpm
  • 495 Ft. Lbs. @ 2,800 rpm

1963 413 Wedge Engine (4-barrel)

  • 340 HP
  • 470 Ft. Lbs.

1964 413 Wedge Engine ( 4-barrel)

  • 360 HP @ 4,800 rpm
  • 470 Ft. Lbs @ 3,200 rpm

Engine Block

The 413 Max Wedge block had a different casting number and was the same as a 413 truck block.

  • 413 Max Wedge casting number: 1852029
  • 413 casting number: 2120529

It was stronger than the standard 413 block used in passenger cars.

Some people claim the Max Wedge blocks are thicker and have more nickel content adding strength.

The 413 Max Wedge engine blocks have notches on the exhaust valve side of the cylinder bores. The standard 413 blocks do not have them. This is to provide clearance for the Max Wedge’s larger exhaust valves.

Engine ID Pad

The Max Wedge blocks have different punch fonts than the standard 413 block. Typically, the font is larger. Also, the stamping for engine size and performance level are different than the passenger 413.

The Max Wedge engine ID pad stamps are the following:

  • 11.0:1 engine: 413 HP
  • 13.5:1 engine: 413 HC or 413 HP-HC

Following the engine stamp (underneath) will be the month, day and year.

A 413 engine block will have the following ID pad stamping:

  • S-41

The letter S symbolizes the year, 1962. Following the engine stamp (underneath) will be the month and day.

Main Bearing Caps

Both engines use the same main bearing caps, but the Max Wedge caps are checked for hardness. Therefore, they may be stronger than the standard engine’s caps.

Cylinder Heads

The Max Wedge cylinder head design is based on the standard 413 heads but with the following differences:

  • 25% larger ports than the standard engine.
  • The heat cross over passage has been eliminated.
  • The deck structure has been strengthened for more positive head gasket sealing.
413 Max Wedge intake ports.
413 Max Wedge intake ports on bottom the standard 413 on top

They have different cylinder head casting numbers:

  • 413 Max Wedge: 2402286
  • 413 wedge: 2206924 or 2206324
The standard 413 exhaust ports on the top and the Max Wedge exhaust ports on the bottom.
The standard 413 exhaust ports on the top and the Max Wedge exhaust ports on the bottom

Valves

Intake Valves

The intake valves are the same size (2.08″) but the underside of the Max Wedge intake valves are streamlined for better air flow.

Exhaust valves

The Max Wedge exhaust valves are 1/4″ larger in diameter. The following are the sizes of both engines:

  • Max Wedge exhaust valve: 1.88″
  • Standard 413 exhaust valve: 1.60″ or 1.74″ depending on year.

Valve Springs

The Max Wedge has dual valve springs, inner and outer, for a total of 32. The 413 has single springs with a total of 16 springs.

Valve Train

Rocker Arms

The Max Wedge rocker arms have adjustments due to the mechanical tappets. They are similar to the rocker arms used in the 413 300-H but include a locknut on the lash adjusting screw.

Other 413 engines with hydraulic tappets have different, non-adjusting rocker arms.

413 Max Wedge engine rocker arms and shafts.
413 Max Wedge engine rocker arms and shafts

Pushrods

The Max Wedge engine’s pushrods are 0.040″ longer than the 413 wedge. This is to compensate for the difference in camshaft timing and smaller base circle diameter of the cam lobe.

Camshaft

The 413 Max Wedge has a more aggressive camshaft, higher lift and more duration. The 413 has a combination of hydraulic or mechanical cams while the Max Wedge cam only uses mechanical tappets.

Camshaft specs:

  • 413 Max Wedge: .509″ lift/300° duration
  • 413 Wedge: .389″ or .430″ lift/252°, 260°, 268° duration (depending on year and model car)

Pistons/Compression Ratio

Both engines were produced with aluminum pistons, but the Max Wedge had forged aluminum. The Max Wedge was produced with higher compression ratios. The standard wedge was produced with lower, different ratios depending on the year.

  • 413 Max Wedge: 11.1:0 or 13.5:1
  • 413 Wedge: 10.0:1 or 10.1:1
413 Max Wedge pistons.
413 Max Wedge pistons

Intake Manifold/Carburetor

The Max Wedge came with one type of intake manifold while the 413 came with different types depending on the year and car model.

413 Max Wedge Intake Manifold:

  • 2 x 4-barrel short cross ram

The 413 Wedge came with the following intake manifolds:

  • Single 4-barrel
  • 2 x 4-barrel tandem
  • 2 x 4-barrel long cross ram
413 Max Wedge intake manifold.
413 Max Wedge intake manifold

The Max Wedge only came with two 4-barrel carburetors while the Wedge came with either a single 4-barrel or two 4-barrel carburetors.

Oil Pan/Oil Capacity

The 413 Max Wedge oil pan has one more quart oil capacity than the 413. In addition, it has front and rear baffles and a swinging pickup pipe which the standard engine doesn’t have.

  • 413 Max Wedge Oil Capacity: 5 quarts plus one quart for the filter.
  • 413 Wedge oil capacity: 4 quarts plus one quart for the filter.
413 Max Wedge oil pan.
413 Max Wedge oil pan

Crankshaft

The Max Wedge crankshaft is similar to the standard 413 except it has hardened journals and shot peened fillets.

The Max Wedge main bearing journals were ground 0.0005″ under the standard size to accommodate the F-77 Tri-Metal heavy duty bearings.

This grounding also provides additional clearances and a greater rate of oil flow between the bearings and journals.

The Max Wedge connecting rod journals were ground 0.001″ under the standard size for the same reasons.

Connecting Rods

Both engines had the same rods, dropped forged “I” beam construction but the Max Wedge rods were specially selected for the best quality.

Fuel Pump

The Max Wedge engine uses the same fuel pump as the standard engine but it has a higher pressure spring to deliver 6-8 p.s.i. at 1,500 rpm.

Exhaust Manifolds

The 1962 413 Max Wedge engine had brand-new exhaust manifolds never used in prior engines or 413s.

The cast iron tubular manifold has streamlined, upsweeping curves with a higher capacity over the standard manifold. The long branches have a 3″ outlet.

413 Max Wedge exhaust manifolds.
413 Max Wedge exhaust manifolds

Accessory and Drive Pulleys

The Max Wedge has a smaller diameter crankshaft pulley to limit belt speeds. All the pulleys have a deeper groove to secure the belt and an air conditioning water pump is used.

A video from my YouTube channel, Ultimate Muscle Car, about the 413 Max Wedge engine specifications.

If you have any questions about the difference between a 413 and 413 Max Wedge, 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

413 Max Wedge Horsepower

413 Max Wedge Specs

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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