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I dont know where the 3100lb figure comes from, but i'd say its pretty far off... but in your favor. Here's the (vague) math:

70 Challenger: 3006lbs base.
70 Mustang FB: lighter.
69 Mustang FB: lighter still.
67-8 FB: lighter still.
65-6 FB: lighter still.
65 Notch: you get the point.




We 4-corner every car that comes through the shop. That weight for the 65 Mustang is a REAL car. Full steel, iron motor, 2 layers of sound deadening, heater and tunes.

Our Challenger weights are all steel car with Glass hood, Aluminium top end on the motor, full interior, no heater, no tunes.

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The unfortunate part about the vintage Mustangs is the lack of engine compartment space. Mod motors don't fit in them without a decent amount of cutting and fabrication. It isn't like an LS motor in a GM product or a new Hemi in an old Mopar, which practically fall into place.



Amen to that. After working on the last couple of Mustangs, I wouldn't put anything bigger than a non-mod 5.0 in them.