[masraum]

Originally Posted by Zeke

I don't think 140 was possible unless....

It was only a 283 from the factory.

The damn things tended to float a little in the front at high speed. My friend's hot rodded '60 hit 130 (on the speedo) with 4:56 gears which is also doubtful. An honest 120 I could buy given how much he had done. His 1/4 mile speeds were low 100's, 12 second or so. It was plenty street fast. He moved up to a 409 sedan.

A Mazda miata with 133hp will hit ~115 with enough runway. I think 911 SC with 180hp are supposed to hit 140. A 3.2L 911 with 217hp will hit 150. I could see a hot 283 SBC with dual quads hitting 140. I would hope that's probably got at least 200hp. It would be gearing dependent. 456 are pretty low gears so would probably put the revs pretty high to get to 140, but may help keep the motor up around it's peak hp.

Per this site, they had anywhere from 220 - 283hp (that was a first, one hp per ci). Most of them had reported peak power at either 5000 or 6200.
https://www.corvet****seum.org/1957-corvette-specs/