Check your grounds....both on the battery and make sure you have a clean connection between the starter housing and the engine block
You might be getting just enough of a connection to start cranking, but when you get good compression, the voltage at the starter is too weak to finish the job.
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67 K-20 350, SM465, Eaton rear, 4.56 no spin option
00 Dodge 2500 4x4, 24V cummins, 5 speed
Chad
South Central Nebraska
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