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The Max Stroke Crankshafts are inspected for the maximum stroke allowed in the 196 box stock classes.
AKRA 2020 Rules for Crankshafts:
Stock Box Stock crankshaft required. Stroke 2.123" +.010" or -.010". Machining, polishing, the addition of material, or other alteration of the crankshaft is prohibited. Stock factory timing gear mandatory and must be installed in the original location. Crankshaft journal diameter is 1.180" max 1.168" min.
NKA 2020 Rules for Crankshaft:
188.8.131.52: Standard OEM item with a stock stroke length of 54mm or 2.126" (+/-.007").
184.108.40.206: No alterations permitted.
220.127.116.11: Journal diameter must be between1.180"-1.168".
18.104.22.168: If needed to prove lack of modification, crankshafts minimum weight
would be over 1700grams.