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Rich et al, The casting date on the side of the block should be before the build date stamped on the boss on top of the engine, next to the distributor (covered by the compressor on AC cars). I've looked at factory Build Code Interpretation doc's produced by Gil from the factory microfiche for the G and F, and the engine number does not appear on them. In fact, there is an example on our club website for Steve Albu's car, in the Tech section, showing that the 300F engine number just states "P41+ Date", so no "HP" designation like the 300G and later has. So, finding a replacement block for a 300F would be easier than finding a correct G block, as the G block must have the "HP" designation, the F does not. Of course, the build date stamped on the boss must be before the build date of the car. There is no sequential number on the boss, only the stamped designation and build date. Bob J From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Rich Barber It would appear that we are talking about two different dates. One is molded onto the block when the engine is cast, the other is stamped onto a flat boss by the distributor when the engine is assembled. The assembly stamp would contain other information such as the brand and model of the car, whether it is high-performance and any issues such as oversize/undersize dimensions—as listed at: http://www.moparts.org/Tech/Archive/motor/36.html The stamped information should certainly lag the casting date and is what identifies an original 300 engine. And, the engine assembly date should be earlier than the chassis assembly date. Now, I’m curious as to whether the IBM build cards or any other document have the original stamped engine ID date handwritten on them? C300K’ly, Rich Barber Brentwood, CA From: Chrysler300@xxxxxxxxxxxxxxx [mailto:Chrysler300@xxxxxxxxxxxxxxx] On Behalf Of Edward Mills Antique Tractors I don't know about the blocks specifically, but many castings have date codes built into the casting - frequently a month and year tag placed in the side of the "mold" before they are cast. Some go so far as to have a day and a shift code indicating which shift made it. I'm assuming it was for quality control in case there were problems to allow rejection of a group of parts cast using the same materials and parameters. These are generally raised letters / numbers on casting. On 1/10/2014 3:13 PM, Fern wrote:
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