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..... pan off ? ... just jam a short piece of 2x4 in there

Ding ding ding I do believe we have a winna. You're obviously stripping it down to a bare block. As said am impact would work fine but since you dont have one you dont need to borrow one (time is money). If the pan wasn't coming off I'd bolt a piston stop across a bore to lock the assy

live every 24 hour block of time like it's your last day on earth