Thanks for the welcome. I have been lurking since a couple years ago when I was attempting to buy a 1998 k2500 6.5. Currently looking at a 1998 Burb 6.5.
So one more question... Why does AMG's GEP site not have any information on the P400? As mentioned above, Peninsular has some information...
Where are you getting the "forged steel crankshaft" information from? GEP's website states "cast nodular iron" as the crank material, with only the cam and conn rods being forged... http://www.amgeneral.com/vehicles/gep/specifications.php
ETA: the linked site is also posting 205 hp/440 tq...