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Aruba1 · 10-02-2021, 08:15 PM

Bringing this thread back from the dead. I just did 150 miles on my 1972 C30 with an LS1, NV4500, 1989 C3500 rear end and brakes. Did an average of 80 mph and topped 90 mph a few times. No problems. Pickup shakes a little bit but I think one wheel is out of round. I had it as fast 110 mph in the past.

10-02-2021, 08:15 PM	#13
Aruba1 Registered User Join Date: Apr 2014 Location: Birmingham, AL Posts: 560	Re: Gas Mileage/ Top End Speed for 72 C20 Bringing this thread back from the dead. I just did 150 miles on my 1972 C30 with an LS1, NV4500, 1989 C3500 rear end and brakes. Did an average of 80 mph and topped 90 mph a few times. No problems. Pickup shakes a little bit but I think one wheel is out of round. I had it as fast 110 mph in the past.