168 tooth flywheel is 14" in diameter and the 153 is 13".
Which one you use depends upon your starter bolts. If the bolts are staggered, use the 168, if the bolts are straight across from one another, use the 153.
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Bob
63 Impala 283/PG/3.36 (under restoration)
66 Impala 327/PG/3.36
66 Chevelle SS 409/M22/3.55
69 Chevelle 307/PG/3.08 (future restoration)
69 C10 short stepside 454/TH350/3.73
69 Custom 30 tow truck 350/4 spd/4.10 (resto done, CRUISIN TIME!)
71 Cheyenne 20 fleetside 350/4 spd/4.10
71 Chevelle 6/PG/3.08
72 Chevelle 454/M21/4.10
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