by Seth G Tue Sep 12, 2017 8:07 am
I think you mean Supervan. The heavy duty versions had heavier springs and 9" rear ends. 1965 and on the Heavy Duty vans had 240 engines. I think the first Heavy Duty vans came out in 64 with 170's. I think they did make Heavy Duty Supervans, but not all Heavy Duty vans are Supervans.
I don't know how much longer they are but I'd guess it's at least a foot.