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131 0205 Proj04 Z

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More good news. The 8.1L is internally balanced and will accept the old 14-inch, 168-tooth, neutral balance flexplate from a 396 or 427. Just don't try to run an externally balanced (weighted) flexplate from a 454 as it will damage the 8.1L's reciprocating assembly. Taking all this information to the next step tells us that an Allison 1000 transmission will bolt up to any internally balanced Chevy V-8!