Before I got the 41 I ran my old Rover cars with inline six motors on unleaded gas for years without any problems. I think Jeff hit the nail on the head, these low revving motors driven normally shouldn't be a problem. Think of the muck they used to run on during WW2.Come rebuild time it would be sensible to put in hardened seats while its stripped down. Just my two bobs worth.
Cheers
Bob
