Many people think the first Nascar 426 Hemi intake manifold was the bathtub design but it wasn’t.
The first Nascar 426 Hemi Engine intake manifold was a single four barrel, dual plane aluminum intake manifold. It was first used during the 1964 Nascar season and its casting number is 2468043.
Let’s take a closer look at this manifold including pictures and a video I took of the manifold during my last visit to the Chrysler Nationals.
The First Nascar 426 Hemi Intake Manifold
The first Nascar 426 Hemi intake manifold was introduced at the beginning of the 1964 Nascar season. In its very first race, the 1964 Daytona 500, Richard Petty won the race with a 426 Hemi Engine which had the four barrel, aluminum intake manifold.
The first version was used in Nascar for 1964 and the abbreviated 1965 season. In 1966, a new bathtub design was released and used.
The First 426 Hemi Intake Manifold Materials
The first version of the Hemi intake manifold was cast in aluminum. Shortly later, the same manifold was cast in magnesium which is lighter than aluminum.
The video below I took at the last Chrysler Nationals showing the magnesium intake manifold version.
The aluminum or magnesium intake manifold version had the same casting number. The casting number is the following:
All the manifolds I have seen also have the lettering “REV. K” directly below the number. The casting number is located in two places:
- On an intake runner directly behind the carburetor mounting flange.
- On an intake runner underneath the manifold in the middle.
If the manifold heat shield is installed, it will have to be removed to see the underneath casting number.
The photos below show magnesium intake manifolds with the casting numbers.
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For the past 40 years, I’ve been traveling to the Chrysler Nationals in Carlisle, Pennsylvania. The event has helped me with studying and researching Mopar engine specs and intake manifolds like the 426 Hemi.
Read More Mopar Engine Articles
- Google Books: Chrysler Engines 1922-1998
- 426 Hemi Exhibit at the Chrysler Nationals