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The ZR2 and the ZR5 both come with the 4.3 Vortec SLS motor, which is cam'd bored and stroked. So its actually not a 262ci 4.3L, its more or less a 275ci 4.5L. This SLS motor was stock with all ZR2's and ZR5's, but it was a rare option when buying a 2WD S-10. I have a 1999 S-10 2WD SLS Regular Cab. It has a cold air intake with true duals (Flowmaster 40's on each side), stock cats, E3 Diamond Fire spark plugs medium grade wires, Mobil1 Synthetic, Fram Filter, all aluminum radiator, serviced my cooling, transmission and the rear-end, everything else is stock. I push 205H.P.-208H.P. (depending on the temperature outside) at the rear wheels. And once again the only mods are a cold air, and true duals. From the factory, you get 190H.P.

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Q: What is the horsepower difference of a stock Chevy2000 S10 and the ZR2 both have 4.3 engines?
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