by Seth G 2017-09-12, 12:07 pm
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.