360 flywheels

George Jets said

Compared to neutral balance flywheels they either have added weight like this 360 / 727 torq converter, or are drilled in areas to offset the needed weight to balance the external balance crankshaft.

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It's strange that the 143 tooth flywheels are always attractively priced but that is for 11 inch clutch and usually for a truck. Try a 130 tooth version for 10.5 inch clutch used in A body and most cars.