Head casting number

[Slider]

Just bit the bullet and ordered a set of trickflow 240 heads. Was wondering what heads the 440 currently had on it to see if they were worth anything. The casting numbers under the vavle covers are 284s8064 along with 10319 on the runner next to it. Can't find any information on these casting numbers on the net. Anyone here know what they might be? I was thinking the 8094 could be actually 9064 and that might make it a 906 head but..... any info would be helpful.

[PRH]

They're 906's.

Sometimes there's an extra number after the 2843906..... I'm not sure what it signifies, but it's not that unusual.

The 10319 is the date code........ Oct 31 1969.

They likely don't have the same date code between two.

[John_Kunkel]

The number following the basic casting number is the Casting Core Index Number...relates to casting core changes.

[Slider]

You guys are awesome. Thanks so much for the info!