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Looking at a set cheap. Wondering if they will be a bolt on for e7s or require machining.

specs are I.D. .697
132#@1.750
280#@1.250
 

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They're require machining. Those are dual springs and won't clear the stock valve guide boss.

The 972-16 single spring is very similar in spec (actually a tad stiffer) but a single w/ damper. That fits. The dual spring dissipates heat better tho.
 
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