i'm not sure who sid bowadich is. has anyone had the rails repaired and run a honda engine on it for at least 20 years to see if it cracks?
the solid decks have a much larger surface area between the deck and underside of motor to generate more "friction" and lessen the lateral forces on the bolts. that would slow the cracking down, but makes sure all the engine vibrations would go into the chassis.
putting a neoprene or rubber block between the motor and rails would only increase the amount of lateral movement on the bolts. putting the larger tapped plates in place of the captive nuts would just mean the rails would twist rather that the captive nut twisting at the welds to the rails.
