This is sort of a mixed up question.
The casting number on my truck's motor is 2324002 corresponding to a 248, although the motor number is A228.
Assuming it is a 248, did all 248's for 1/2 ton came with roaddraft crankcase ventilation? On Maintenance manual it says so.
Can a road draft crankcase ventilation system can be changed to a positive type, provided I can find a valve cover with the plug, the manifold and the PCV valve?
Which factor determines the milage the oil should be changed, having a PCV to road draft or not having an oil filter to having one? I have a road draft tube and no oil filter, but don't want to change oil every 1000 miles. Ive seen configurations with the two (bypass and full flow) filters. What do you recommend?
Thanks
