what /6

Thanks for the replies folks. But I must be blind now that I have retired from the Army after 21+years. I could not see any type of pad on the right side of the motor near #1 or #2 spark. All I seen was the alt bracket. I did see however on the left side what appears to be cast number (2806830-7, would that tell me what size it is? Only reason I ask is I want to get rid of it but need to know what size to tell folks interested. All the help I can get would be great. Thanks again.
Jeff