When you had the starter torn down, was there any evidence of the field and armature rubbing? if the shaft bushings are worn, it may drag pretty hard. Is the battery rated at 675CCA or did it load test at that?
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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