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  1. Y07Roadrunner

    8 3/4 pumpkin change info

    Reference vehicle is a '70 Roadrunner. I currently have 3.55 gears in my 489 case 8 3/4 rear end. Great gears for cruising around, but in the interest of doing more comfortable highway driving (legal speeds and otherwise) I picked up a 489 case with 2.76 gears. The "new" case has been...
  3. Y07Roadrunner

    Engine Decoding Assistance

    Can someone help me decode the engine stamping pad on my 440? I know F440 = 1970 440 cid And the sideways "A" should mean .020 oversize bore from the factory What throws me is the 11 20 and the letter after the first H. Could it be "HP" for high-performance? Any help would be appreciated!
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