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Haven't used one, not sure how common they are for SBC's. Don't recall any discussions about them on this site. They seem more common for some of the Ford stuff. I think you need to use studs with them though which will require a line hone. Mine is a 2 bolt I just studded the block and had it line honed. Figured I should be fine for 400/450 HP.
 

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My experience was that the girdle doesn’t increase any clamping force on the mains and doesn’t really increase stability like a girdle in a Y block where the girdle is fastened into the pan rails. If you have to change fasteners then I would align hone the block and put studs in.
 
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