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Hello,
According to the 911 cam table I found at Carquip, the 1973.5 911 t w/cis came with 911 105 141 00 on the left and 911 105 142 00 on the right.
My car has the cams that came in a 1974-77 2.7 S and carrera 911 105 143 00 left and 911 105 144 00 right.
The only thing that seems interesting is that the lobe of the T cam is 38mm on intake and 37.48mm exhaust and the S cam is 38.43mm on intake and 37.38mm on exhaust.
maybe it works as is or perhaps it was ground to stock.
Intrigue!
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