About the only thing I can remember for Chevy V8's is that the 400 small block needs to use the damper designed for it due to being externally balanced. I have never had a truck with a straight six so I ain't much help.
1957 Chevrolet 5700 LCF 283 SM420 2 speed rear, 1955 IH 300U T/A, 1978 Corvette 350 auto, 1978 Yamaha DT175, 1999 Harley Davidson Softail Fat Boy
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