Stan Thanks for putting up the info, I was curious if the 355D had its own s/n batch? Also i have a 350C with a 251xxx s/n (which is a 76' according to the chart) and it has a 3152 in it. Not sure when they switched to the 3164, but i have sales brochures from 75', 79' and 83' for the 350C and they ...