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Having owned a 340 as well, I know exactly what they were capable of. Yes they were lighter than the big blocks but the difference lies more in their ability to build rpm's under load considerably faster than a big block could back then. A bone stock 340 4 spd. that was well tuned and with a good drag driver could turn low 14's with the 3:23 rear end. 3:73's or 3:91's would get you into the high 13's. Push it out to a half mile and the big block will wave at you as he goes by.I miss my Duster.
Having owned a 340 as well, I know exactly what they were capable of. Yes they were lighter than the big blocks but the difference lies more in their ability to build rpm's under load considerably faster than a big block could back then. A bone stock 340 4 spd. that was well tuned and with a good drag driver could turn low 14's with the 3:23 rear end. 3:73's or 3:91's would get you into the high 13's. Push it out to a half mile and the big block will wave at you as he goes by.
I miss my Duster.