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I drive a 2001 Blazer with ZR2 package - which means factory 31x10.5" tires, factory lifted & widened suspension, flared fenders front and rear to accommodate, larger rear axle which hangs lower below the body, bigass 31" spare tire mounted to rear of vehicle, etc...
65mph on a level highway with no wind seems to take 50-60hp according to scangauge, 75mph takes 85+ hp, 90mph takes 140hp, 124mph (governor deleted) takes 228hp according to scangauge - which is the highest speed I can sustain. - note that this driving at high speeds is done at Stellar Airpark where I have permission from one of the residents to occasionally borrow a side strip. (for those who point out the stock 4.3L has only 190hp, true - I've some intake and exhaust work done, retuned PCM from wait4me, MSD ignition, and have updated to MPFI from the older CSFI - the 228hp is as indicated on scanguage when travelling 124mph)
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