RS500

Check where the Alternator Braket bolts on.......the RS500 block was slightly different there.

Basically, the RS500 had an Alternator Bracket which lowered the alternator, but you can't bold an RS500 Alternator Bracket straight onto a normal 205 Block without grinding a small lug off the block. The RS500 dosen't have the obstructing lug there. Kind'a hard to explain, but once you compare the two you'll see what I mean.

And put up the Engine Number.......