426 Hemi Rod Journal Size: Rods Journal and Bore Sizes
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426 Hemi Rod Journal Size: Rods Journal and Bore Sizes

The size of the factory 426 Hemi rod journal size is a question which comes up often. Let’s examine what the 426 Hemi rod journal size is. The 426 Hemi connecting rod journal diameter is 2.374″-2.375.” The rod bearing bore size or outside diameter of the rod bearing is 2.5000″-2.5005.” This article will explain the…

426 Hemi Main Bearing Size: Journal and Bearing Bore Sizes
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426 Hemi Main Bearing Size: Journal and Bearing Bore Sizes

The size of the factory 426 Hemi main bearing journal and the main bearing bore size is a question often asked. These measurements are necessary for bearings and clearances. The 426 Hemi main bearing journal size (diameter) is 2.7495″-2.7505.” The outside diameter of the main bearing or the main bearing bore size is 2.9425″-2.9430.” This…

How Rare is a 426 Hemi? The Rarest Hemi Car Models Produced
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How Rare is a 426 Hemi? The Rarest Hemi Car Models Produced

Many people like to talk about the rarity of a particular car model or engine option. This is especially true discussing the iconic 426 Hemi engine. How rare is a 426 Hemi? During the 426 Hemi’s production, only 0.7% of the car models which offered the engine as an option were produced with the 426…

426 Hemi Production Numbers: All Cars Produced (Each Year)
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426 Hemi Production Numbers: All Cars Produced (Each Year)

Many people wonder how many 426 Hemi engines were produced for cars available to the public. There was a total of 10,669 426 Hemi engines produced for production cars between 1964 through 1971. This figure includes race and street versions. Of the 10,669 426 Hemi engines produced for production cars, the following is a breakdown…

426 Hemi Idle Speed: Idle and RPM for Auto or Manual
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426 Hemi Idle Speed: Idle and RPM for Auto or Manual

Many Mopar owners wonder what their stock 426 Hemi should idle at or was set by the factory. The following are the 426 Hemi idle speed specs for each year. This article will dive into more detail including the fast idle speed specifications for each year. In addition, I’ll explain the discrepancy in 1969 and…

426 Hemi Head Casting Numbers: Easily Identify Hemi Heads
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426 Hemi Head Casting Numbers: Easily Identify Hemi Heads

You may be wondering what that old Hemi cylinder head casting number for sale is or collecting dust in your neighbor’s garage. The following are the 426 Hemi head casting numbers for the production street and race cylinder heads: The following 426 Hemi head casting numbers are for less common, experimental or revised race cylinder…

The Differences Between a 426 Hemi and a 426 Wedge
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The Differences Between a 426 Hemi and a 426 Wedge

Since both engines are iconic and share the same cubic inches, many people ask about their differences. Let’s answer, what is the difference between a 426 Hemi and a 426 Wedge? The main difference between a 426 Hemi and 426 Wedge is the cylinder head design. Hemi has a hemispherical combustion chamber and the Wedge…

426 Hemi Wrist Pin Size and Pistons: Length and Diameter
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426 Hemi Wrist Pin Size and Pistons: Length and Diameter

One of the common questions about the 426 Hemi is its pistons, rings and wrist pins. Let’s examine, what size pistons are in a 426 Hemi? 426 Hemi pistons are made to fit the 4.250″ bore size. They weigh 841-845 grams and have an overall length of 4.060 in. The wrist pin size is 1.0310″-1.0312″…

426 Hemi Firing Order: Mopar Cylinder & Distributor Location
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426 Hemi Firing Order: Mopar Cylinder & Distributor Location

For people tuning their own engine, knowing the firing order of their Mopar is crucial. Let’s find out what is the firing order on a 426 Hemi? The 426 Hemi firing order is 1-8-4-3-6-5-7-2. This article will inform you where the cylinder numbers are located on the engine. In addition, where they are on the…

How Many Miles Per Gallon Did a 426 Hemi Get? Each Year MPG
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How Many Miles Per Gallon Did a 426 Hemi Get? Each Year MPG

One of the questions asked about the Hemi engine is gas mileage. When driving a beast like this, who cares? Even though, let’s answer, how many miles per gallon did a 426 Hemi get? 426 Hemi cars averaged 11 miles per gallon overall with a range between 7 and 14 MPG. The lower end represents…

426 Hemi Compression Ratio: Street and Race Hemi Engines
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426 Hemi Compression Ratio: Street and Race Hemi Engines

Many questions popup overtime about Chrysler’s most iconic engine ever produced. One of the topics asked about is the 426 Hemi compression ratio. The 426 street Hemi had a 10.25:1 compression ratio. This engine was produced by Chrysler with the same ratio from 1966 to 1971. The 426 Race Hemi had a 12.5:1 compression ratio…

What Problems Did the 426 Hemi Have? Street and Race Hemi
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What Problems Did the 426 Hemi Have? Street and Race Hemi

The 426 Hemi did have some problems during development and post production. Let’s take a close look at them by answering the question, what problems did the 426 Hemi Have? During development the engine blocks were cracking and the piston wrist pin assembly was failing. Post-production there was carburetor related issues like idling and difficulty…

Who Invented the 426 Hemi and Designed It: The Chrysler Hemi
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Who Invented the 426 Hemi and Designed It: The Chrysler Hemi

The Hemi Engine was such a huge success and is iconic in the automotive industry. For this reason many people wonder who invented the 426 Hemi and designed it. The 426 Hemi Engine was invented by the Chrysler Corporation headed by President Lynn Townsend who commissioned and approved the development. Assistant Chief Engineer Willem Weertman…

Where Was the 426 Hemi Built? Chrysler Hemi Engine
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Where Was the 426 Hemi Built? Chrysler Hemi Engine

With an engine as iconic as the 426 Hemi, many people want to know everything about it. This includes where it was actually built. The 426 Hemi Engine block and cylinder heads were cast and manufactured at the Indianapolis Foundry located in Indiana. The block and head castings were then sent to the Marysville, Michigan…

The Difference Between a 426 Street Hemi and a 426 Race Hemi
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The Difference Between a 426 Street Hemi and a 426 Race Hemi

The 426 race Hemi came before the 426 street versions. To make the race engine more streetable, changes had to be made. Many people ask me how they differ. Let’s examine the differences between the two engines. The differences between a 426 Street and race Hemi are the street version’s lower compression ratio of 10.25:1…

The 426 Hemi Dual Overhead Cam Engine – The “Doomsday Hemi”
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The 426 Hemi Dual Overhead Cam Engine – The “Doomsday Hemi”

I’m often asked about the 426 Hemi and its specifications. One topic coming up is about an overhead cam design. Let’s answer, is the 426 Hemi DOHC? The 426 Hemi is not an overhead cam design engine. A 426 Hemi dual overhead cam engine was designed as a prototype in 1964 but was never completed…