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  1. T

    91 Octane in a 340?

    Im wondering if I can run 91 octane, so far I've just been running 94 but it's expensive and harder to find in my area. The engine is mostly stock from what I understand, so 10.5: 1 pistons pre 1971 with X heads. Though im not sure of the cam but I believe it's a COMP XE284 high lift but might...
  3. T

    Revving 4000 rpms on the highway

    Hey Guys, pickuped up a 70 Dart swinger 340. It's supposed to be 3.73 gears which feels about right ( I had a 3.91, 360, TF 727 Auto before). For some reason the tach is reading 4000 RPMs at 62MPH, I verified the speedometer is correct with a GPS app. Should I not be revving around 3200 rpms? Is...
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