440 Six Pack Cylinder Head Casting Numbers: Big Block Mopar
There are a few reasons why you would want to know the casting numbers for a 440 Six Pack engine.
The following are the Mopar 440 Six Pack or Six Barrel cylinder head casting numbers:
- 2843906: 440 Six Pack/6BBL (1969-1970)
- 3462346: 440 Six Pack/6BBL (1971-1972)
A few known Six Pack/6BBL engines were produced in 1972, although the numbers are extremely limited and rare.
This article will explain some general details about each head including where to find the casting numbers.
How to Identify a Mopar 440 Six Pack Cylinder Head
The best way to identify 440 Six Pack or Six Barrel cylinder heads is to check the casting number.
How to Find the Six Pack Cylinder Head Casting Numbers
The casting numbers are a raised seven-digit number. They are typically found in two locations on the head.
- The first location would be on top of one of the intake runners. If the cylinder head is still bolted onto the block, the valve cover has to be removed to read this casting number.
- The second location is on the underside of the head on an intake runner. If the cylinder head is still bolted onto the block, the intake manifold has to be removed to read this casting number from underneath.
The casting number location is typical for most Mopar RB-series big-block engines.
Mopar 440 Six Pack or 440 Six Barrel Cylinder Head Casting Numbers
| Cylinder Head Casting Number | 440 Engine | Year |
| 2843906 | 440 Six Pack/440 6-BBL | 1969-1970 |
| 3462346 | 440 Six Pack/440 6-BBL | 1971-1972 |
2843906 Cylinder Head Casting Number
Also known as the 906 heads, they were used on all 440 Six Pack/6BBL engines for 1969 and 1970.
3462346 Cylinder Head Casting Number
Also known as the 346 heads, they were used on all 440 Six Pack/6BBL engines used in 1971.
They were also used for the handful or less of the 440 Six Pack or 6-BBL engines which snuck out of the factory in 1972.
Check out more Mopar cylinder head casting number articles:
If you have any questions about Six Pack cylinder heads information, send us an email found specifically on our contact page.
For the past 40 years, I’ve been studying and researching Mopar engines and cylinder heads like the 440 Six pack. I torqued my first 440 heads 38 years ago while building my first Mopar engine.
In addition to my personal experience, I’ve read books, articles, magazines, watched videos, attended seminars and spoken to other Mopar experts to expand my knowledge.
More Mopar Six Pack Engine Articles
440 Six Pack Cylinder Head Bolt Torque Sequence and Specs
How to Identify a 440 Six Pack Engine
Article Resources
- Chrysler Engine Service Manuals: 1969-1972
- Wikipedia: Chrysler B engine
- Google Books: Chrysler Engines 1922-1998
