Comp Polymer Box Upper. (Comp Cams) They are made for stock or Cobra lowers. Bolted right on after I got the right length allen bolts, because of the spacer.
Mine is strange, the top has a metal plate on it. Most have just a sticker.
Low end suffers a little. But it pulls hard from 2500 and up. I still get 22 + mpg.
I recomend doing it.
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Frank
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