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Do you also have an A-100? In that case, yeah, it's a pain to put in a bigger MC. We did a lot of grinding to clear room for the 1 1/8" aluminum MC, it's a lot longer compared to the single jug type.
It did bolt on no problem with the adapter (AndyF type), but there's not a lot of room around it like in most passenger cars.
Also, 1 1/4" MCs will not bolt on, diff bolt pattern.



Ran, after reading this, I have a thought for you. Since your 1 1/8" is already "fitted" to the van, there may be a rebuilder that could bore that one to 1 1/4" and stuff the rebuild guts for that size into the casting. Unless the casting is real thin somewhere (which would be a separate concern), another 1/16" in each direction should be fine!