They appear to be about the same size as the Flywheel bolts on my engine stand motor. Maybe 12mm x1.25 or so. 17mm socket fits them. Length, dunno. I leave the mount on the block when I pull the motor.
Sean, they are the same one for the front mount. Please use the appropriate grade bolt for your motor mount. Thread pitch, diameter, length and grade are important to get right.
Lock Washers on the block would work. In a high heat cycled area, they are of little to no use. I just checked and I do have what appears to be two flywheel bolts holding it in. Both are marked "11" or maybe "II". Hard to say if that is an eleven or something else but I'd go with at least a 10/10.5 if so.
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