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All the 400 and 360 flywheels are exteranlly balanced
I think you'll find that some 400 4-speed cranks were forged and are internally balanced...basically the same forged crank found in the 383.
Unless that 383 is a cast-crank '71. Sorry, John, hadda say it.
Take a look at the 1972 Mopar Parts Catalog page 9-01-0 Note 2 states "The 400 engine can be built with either a forged or cast crankshaft............"
Same pub shows the forged 400 crank P/N as 2268114...same as the 383 back to '62.
The INTERNET, the MISinformation superhighway
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