Sabbathrocker
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Sabbathrocker

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Sabbathrocker was last seen:
May 2, 2009
    1. 5spd GT
      5spd GT
      In simple terms, a larger crank (3.25"-3.40";) will give you more cubic inches. More cubic inches requires more air to feed. More air to feed equals more fuel needed. All else being equal, gas mileage will decrease a bit.

      I gained about 3 MPG after a H/C/I swap on a 302. The engine could breathe and run easier, which equated to less gas used. Now, if I then added a 3.25"-3.40" crank (requires new rods/pistons as well), then gas mileage would decrease, but total power output would increase.

      It is a catch 22 situation. Good Luck!
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    1967 Mustang coupe
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    needs to be completely rebuilt

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