npub1sl807nla76t36rtc8luqkm9v0xfere2mf7l4zmtmvhltalea3q3syxa8a2 (npub1sl8…a8a2) npub1j4tknr296sglg8r5fzcvv6ettnmuf0mglvaqdj9tjdeyz8wvekns0mg5c9 (npub1j4t…g5c9) KMH? Because the stock motor/trans/diff ain't EVER touching 140mph. KmH for sure.
But 90% of the big V8's from the 60'-80's were pushing like 140-350 whp. Even then the most powerful factory V8 was a 68 427 COPO Camaro making like 400-450whp because it was a purpose built racecar basically maxed out from the factory & able to bypass restrictions.
Thanks to the internet they now have top speed calculators. You can enter the weight of your vehicle, the engine displacement, the horsepower output, the transmission type, and finally the gear ratio. It'll give you a really good number of what is the maximum achievable top speed given that setup.