how big could the motor be on the chalenger?
The motor could be as big as your imagination. There are so many after market kids and mods to be done to that car is seems like there is no end in sight.
I'm not positive but I think the largest engine you could get in plain challenger was a 383. The RT model was available with the standard 383-4V then 440-4V, 440-6V and 426 hemi. moparfan4404
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