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I have a 1996 mach1 670 with the twin pipes that is stock, I found a set of engine cases from a 1998 formula 500 deluxe that I'd like to clean up and port and then throw my crank and heads on, are these cases the same? they look pretty identical but I dont know if the bearing journals are the same size etc....I would just port my cases but I feel more comfortable have a spare set so I actually have something to ride this winter.....thanks
Brian
 

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Both cases are similar as they both share the same crank bearings: PTO 6207, Mid section 6206 and MAG 6206 so the bearing journals are identical. Where these cases differ is the area where the con rods pass the upper case windage shelf and the tunnel ports. Since you are grinding them this will not pose any problem.
 
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