A properly driven stock Boss 302 can hang well into the 14's. The reason it's not a quarter mile monster is that with valves larger than that of the 428, or even the mighty 427, it needs serious RPM's to hit it's powerband. Below 4000 rpm, you're not going anywhere.
That makes the Boss particularly difficult to get a good launch. Much below 4000rpms, you get bog, above, wheelspin. The gearing was not set for optimal 1/4 mile performance either. The suspention is also set up for road racing as well. I wouldn't doubt the Boss loses 1/2 a second in the 60ft alone. Making that up at the end of the quarter is difficult.
Also the fact that the Boss 302 is a semi-hemi like the 351C it's going to be all the more nose heavy.
In reality though, I don't own or drive one, and my uncle hasn't raced his yet, so I can't tell you what he has been able to get out of his. All I know is what the de-tuned version had for hp.
I'm sorry I misread your post about the hi-po 289. I just re-read it and I don't know where I got that info.
You indicate that the Boss 302 tested had the speed to run 13's, and that is probably coming away from the 60ft several mph behing the new GT. Making up that kind of ground takes serious hp.
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