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That is true however there are atmosphear changes and that CDR valve is known to reak havoc on the Military engines but it is required to make the engine sealed from dust and other outside elements unlike the CIV version of the 6.2. If the government went through the trouble to put it there and...

Thecliosed flat metal cap will cause oil leaks since there is no way to vent excess pressure. You MUST use the tall vented cap to allow intake and exhaust of crankcase pressure. The cap is available from any autoparts store but you must look up for a 1978, 79, 80 chevy diesel truck with the...