<div class="ubbcode-block"><div class="ubbcode-header">Originally Posted By: WILMASBOYL78</div><div class="ubbcode-body">The 6223 was used in both the 350hp and 375hp motors...the low horse motors starting in 1969 got the cast crank. My old "How to Hotrod Big Block Chevys" says the L78 crank was also "tufftrided" ...not sure how to tell about that.
And yes, the 6223 was used in all the Nova 396 and 402 applications since the low horse L-35 396 was never available in the Nova.
This link takes you to a previous discussion on the subject that should help...
https://www.yenko.net/ubbthreads/ubbt...;Number=183293
wilma
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"tufftrided" = hardened = a grayish tint that may be dark, almost black, after years of running, from what I have observed. I have issue with Colvin's, if 69 is latest year of usage stated, as this crank was used in 1970 L78's as well. Don't forget another tell tale of an L78 crank (6223) opposed to the 350hp crank and early low horse 325hp and 366 truck engine is that the tufftrided is also cross-drilled through the main journals.
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69 SS/RS 396 M20 X22 Nor 12B,72B,712 bought 1979
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