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The 454 is an externally balanced motor and requires counterweighted flywheel and harmonic balancer. I have a flywheel I don't need, but have $65 into it and I'm along way away from you. If you want to figure shipping I'm in Marysville, Washington 98270.
The small block 400 is also an externally balanced motor. I'm not sure on the other differences as far as small block vs big block flywheels. I always thought they were interchangable, but there are size differences depending on clutch size etc.
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Marysville, WA (Dan72cst@hotmail.com)
72 4wd Blazer CST 350/350
72 4wd Chevy LWB 350/350
68 2wd Chevy LWB 327/400
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