That depends on the engine option that 1990 Camaro Z28 has. If it was optioned with the 5.O Liter TPI with the standard exhaust it had 225 horses. Opting for the 5.0 Liter engine with the optional exhaust increased horsepower to 230. If it had the larger 5.7 liter engine then it had 230 horses with a standard exhaust.
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