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As an overview from the link there was a few issues stated with the earlier 6.5s from GM. Once their military division took over the engines in 2000 then AM General started fixing issues until the P400 beast.
You can quite easily determine the manufacture date of your potential purchase by searching for the stamp. It is located on the block (topside) near bell housing connection.
As an example; mine says G200.
G = seventh month 'July'
20 = 20th
0 = 2000
(First of the military Optimizers I believe/hope)
You never know, your potential beast could be well worth it if it had a P400 under that hood!
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