Anyway, the Build Date Code is based on a 10,000 day table and you need to refer to a table in the book. The date # 3374 is a bit weird and again may not be the same as my newer book, but it's prolly similar so you would need a book covering your years to get accurate info. On the Block serial # The 'c' most likely stands for Car (They also had 'T' for Truck, 'LC' for Low Compression, etc.) and the 'P' is most likely the build plant code. September of a year begins the new production year for American vehicle Manufacturer's, so if it was 9-25-70 it would then be a 1971. The '2' in the casting # is most likely the plant # that made the casting of the block. Keep in mind also that the numbers vary from groups of years and sometimes from cars to trucks and vans. Most of the designations are listed in the parts manuals for specific years of vehicles. In addition, a dual-row timing chain and windage tray were installed to keep the bottom end happy.The parts book I have is much newer than that, but I might be able to help a little. On top, an Edelbrock intake manifold and three Holley two-barrel carburetors provided the fuel and airflow. These heads featured revised intake runners to provide for pushrod clearance, big ports along with 2.02-inch intake and 1.60-inch exhaust valves. The 340 Six Pack engine has always been one of the favorites for Mopar enthusiasts, as they were factory equipped with a forged crankshaft, 10.5:1 compression ratio, and high-flowing “915” cylinder heads from the 360 Mopar. We’ve seen much worse come back to life with a bit of TLC. The engine still wears the standard-size bores, so a cleanup will likely be necessary, but the meat is all there – it’s up to you to provide the cheese. However, it does appear that the parts will clean up with a bit of effort and money, so maybe it’s worth it to take a look if you’re in the market for a truly original Six-Pack block and heads. The engine wears the correct OB303458 serial number for AAR/TA 340 Six Pack production and has been sitting in a shed for an undetermined amount of time, evident by the prolific rust seen in the photos. So when this barn find popped up on the ol’ eBay radar, we had to check it out. To find one of these engines available for sale is rare even more so to find one with matching numbers. Those engines were split between the AAR ‘Cuda, with 2,734 examples, and 2,339 T/A Challengers making up the balance of 340 Six Pack production. With only 5,123 examples produced in 1970, Mopar’s Six Pack 340 engine leans toward the very rare end of the musclecar spectrum.
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