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The studs that broke are inside the lower valve covers. They are the ones with barrel nuts and thick washers placed along the top of the head inside the deep holes not the ones that are lower down on the heads. Maybe the lower ones (the ones with the hex nuts) are not head studs at all? I thought there were 4 studs per cylinder. Also the broken ones are dilivar and don't respond to a magnet.
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John
Original owner '81 911SC blackmetallic coupe. Terbatrol, SSI, M+K Gen 4, SC+ cams, A/C delete, console delete, heater backdate, 7 & 8 x 16 Fuchs with polished rims, Turbo tie rods, tensioner update, Rennline engine mount bar, Mainely Custom sump plate, new top-end, corner balance.
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