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Cutting, welding or modifying in any way voids the SFI rating for the bellhousing. That said, if the bottom flange catches on something, the parallality of the bellhousing can be lost. Then you have to have it blanchard ground to bring the tranny mounting surface into parallel with the back of the block. So if it may catch, and you don't ever do any track events where the tech inspector will notice the modification, than trim the flange. But be sure to measure your new bellhousing for crankshaft centerline and for parallality with the back of the block. It takes fifteen minutes and needs to be done on any bellhousing. Offset dowels are cheap.
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In a fit of 16 year old genius, I looked down through the carb while cranking it to see if fuel was flowing, and it was. Flowing straight up in a vapor cloud, around my head, on fire.
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