For my own future reference, is there a way to tell if it's had the double-row chain conversion by just looking at it? Can you see the chain thru the oil filler hole, or anything like that?

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past MB rides:
'68 220D
'68 220D(another one)
'67 230
'84 SD
Current rides:
'06 Lexus RX330
'93 Ford F-250
'96 Corvette
'99 Polaris 700 RMK sled
2011 Polaris Assault
'86 Yamaha TT350(good 'ol thumper)