You dont want poly on the uppers. It will cause it to bind. I dont know of one that has a good enough design that wont. So rubber for the uppers at least. Lower, not to sure about, but i think you can run poly with no issues.
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313/304 new #'s
Only 8.5:1
Engine built and tuned by Coastal Dyno.
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Matt Frewer
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George Carlin
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