Originally Posted by Diseasel300

My SDL was starting just like yours - BIG white smoke and lopey/shaky/crappy idle for 5-10 seconds then suddenly "smoothed out". Was delivery valve seals. Been starting on the first or second compression hit with 0 smoke (other than the oil it burns) since I redid them.

You're right though, the early 603's are NOT slow! I've had people in my SDL that were surprised to find out it's a diesel! Certainly doesn't drive like one.