I don't doubt that Ed & his son are accurate with their own experience - There was no way this one would have come off with a gloved hand however.
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... It's a standard left hand thread, so make sure you don't think bass-ackwards!
As for left-hand thread? Think that one over again!

'51 Chevy 3100 Truck - OEM 216 Engine; three speed column shift transmission
6 Bolt disc conversion with dual master/vacuum booster
12V alternator conversion.
235 engine in waiting grin