True horsepower?

That' possible on account of the factory polyglass tires were still screaming going into 3rd gear. There had to be a half second in that alone.
The Manitoba government built a huge ditch to divert spring floodwaters around Winnipeg in the late 60s. The gates were about a half mile from our house, and had a concrete roadway over top. We used to go down there at lunchtime in grades 11/12 and see who could lay rubber the furthest. Swinger on Polyglass tires for the win! But you know,street tire technology was in it's infancy back then, and it hardly mattered what tire or how big it was, 340s just roasted them all. I owned that car for 4 years, and put 7 sets on the back, even running some custom slapper bars. She went 14.41 on those little Es
4.10s were a colossal mistake on the street. But after I blew the 3.55s up, This 18 yr old know-it-all said what the heck, the whole pumpkin, LSD and all was $65.00,sooooooooo in it went. That 340 blew a lot of stuff up, including itself,finally.

Before I bought that '71 340/727 car I had a very nice near pure stock '71 340 Cuda Stick car in met brown, forget the actual color name, I remember taking it to SPR for a couple of runs with some old what we called "cheater" slicks, they were not much better than road tyres but if you fried them they worked reasonable, that went a best of 14.48 at around 97mph, taking it relatively easy so there might have been a low 14 in it if I gave it all the beans.... I just cannot see any stock 340 3600lb car running 101mph with 3.55/8" slicks, but whatever were just trying to talk "true hp" and using actual track times is better than speculating whether they were underrated or not, they were/are just an amazing motor.