In an OBS, Group 65s. I bought blems from Interstate.
In a bricknose, if you can make the room to run Group 31s, I would do it, and I believe there should be some history on bricknose installation requirements if you do a search. Group 31s are always available (think of all the heavy trucks that use multiple batteries in every truck) and I seem to remember the truck shops always ran some really good specials on Group 31s in the fall.
Either should fire your truck just fine, but I think when you are talking old school battery technology, I'd go with Group 31s.
In a bricknose, if you can make the room to run Group 31s, I would do it, and I believe there should be some history on bricknose installation requirements if you do a search. Group 31s are always available (think of all the heavy trucks that use multiple batteries in every truck) and I seem to remember the truck shops always ran some really good specials on Group 31s in the fall.
Either should fire your truck just fine, but I think when you are talking old school battery technology, I'd go with Group 31s.