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Oh it's a night n day difference in power... not even close. Plus the Vortec 350 works better with the 4.56 gears. The tach is showing 2900rpm at 60mph. 3000-3500rpm is easy for a 350. Yes it will run on 87 octane, but I prefer to run mid grade 89 octane. I haven't gotten a pulse on the...

The Vortec 350 swap is completed. Just needs a lil find tuning and AC lines. The only upgrades were MPFI injectors and the GMPP 395 cam. The truck runs like a sewing machine; step on the pedal and it winds up n goes. With ths 255 85r16 tires it'll run 60mph at 2900 rpm **if anyone does the...