350 to 454 swap

[INSIDIOUS '86]

Originally Posted by bnoon

Don't forget, you can get a dual pattern flexplate and use either converter bolt pattern! If you already have a high dollar converter, this may be a cheaper option for you. Also in case people don't know, the same converter will stall slightly higher (few hundred RPM) on a big block in most cases from the added low end TQ.

I think outs was single pattern which was the issue. And being that a 454 is external balance it's not a great idea to change them
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