AMG/GEP 506 Navistar Longblock ID

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AM General assumed 6.5 engine production in mid 2000, and quickly handed block and cylinder head casting duties off to International Casting Corporation (Navistar) in 2001. International has been casting all of the 6.9L/7.3L/6.0L/6.4L diesel engines used in the Ford pickups since 1983.

The first Navistar/AMG 6.5 rolled off the General Engine Products assembly lines in November 2001. Those made since November 2001 are the very best 6.5 production engines - so far.

Navistar was tasked with solving the cracking problem GM experienced in both the cylinder blocks and the cylinder heads. Navistar accomplished this by increasing the moly content in the block and introducing a number of design changes. The cylinder heads saw an alloy change to include more chromium.



This photo shows an International/Navistar/AMG produced 6.5L diesel longblock, and was shown to us during the 2005 Rendezvous in Salt Lake City by Peninsular Diesel - who is an authorized retailer for AMG/GEP.

The numbers 1-7, as indicated in the above photo help to describe how to identify these blocks.

1- The Navistar symbol is cast into the engine valley.

2- The "506" casting number can be found in a few places on the block. The two #2's as identifed on the photo include the 506 number.

3- The casting date is also an indicator of when the block was actually cast by International. It should show a date of November 2001 or newer.

4- These blocks include two Oil Pressure Switch ports. The valley location was used by the 1996 or newer civilian model engines.

5- The OPS bellhousing flange location was used by the 1992-95 civilian model engines.

6- This pipe is used as a valley drain. Any liquid accumulating in the valley can drain through this line to a location above the oil filter.

7- This is the engine speed sensor used by the 4L80-E automatic. It is afixed atop the oil pump drive assembly.

Jim