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The 911 S with cis have casting numbers ending with 143 and 144.
These cams would work in place of the original carb T cams but the improvement would be small. Definetly not worth the effort unless your engine was out and you needed to replace the cams.
A better choice would be grinding your T cams to E specs.
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John Dougherty
Dougherty Racing Cams
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