Hi guys, im new to these forums. Ive recently restored a 1960's Masport Rotacut and noticed something odd with the engine blocks. pcamore suggested i ask this on here, so here i am. What ive noticed is that some engines have an extension on the bottom of the block that helps support for the crank shaft and other don't. Ive got two d400's and two d500's. one of each has this extension and the others don't. Given the age who knows if they are all original parts or not but i though it was odd. Any one know why this might be? Ive attached a picture showing the two engines side by side. Cheers.
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