with a squeaky-clean exhaust? A healthy dose of common sense, the right parts and an eye for details. In this particular case, the payoff is a car that, in full street trim (with a complete emissions-legal exhaust system in place and a full factory interior) has recorded quarter-mile times of 12.264 seconds at 111.95 miles per hour and exhaust emissions of 0.0% carbon monoxide (CO) and 34 parts per million hydrocarbon (HC). Those emissions levels are well below the typical allowable maximums of 1.2% CO and 220 ppm HC.
    

configuration, the 350 cubic inch small block was rated at 230 SAE net horsepower. By 1991, the rating had risen to 245 (250 horsepower on coupes with 3.07 or 3.33 rear axle ratios). That’s a significant increase, considering the constraints imposed by full emissions controls. But with Fourth Generation Corvettes tipping the scales at over 3,200 pounds, 250 horsepower doesn't deliver drag strip heroics-- especially when owners of modified 5-liter Mustangs are a constant source of humiliation.
     So what does it take to build an engine that can turn a 1985-91 Corvette into a quarter-mile terror

Is it stock or is it modified? It’s difficult to tell the difference unless you look very closely. The stock "Tuned Port Injection" ID plate on the throttle body would seem to indicate that this is a stock engine but ID plates can be easily changed.

CNC-ported 1988 and later Corvette aluminum heads with 190cc intake ports offer excellent power potential. In fact, they will flow more air than can be put through modified Tuned Port runners.

<% Set Ad = Application("Ad") %><% arrTags = Array("ad.size.onesixth", "ad.targetframe.new", "ad.border.0", "site.corvettemagazine") %><% = Ad.GetAd(Response, arrTags, Null ) %>

<% Set Ad = Application("Ad") %><% arrTags = Array("ad.size.promo", "ad.border.0", "site.corvettemagazine") %><% = Ad.GetAd(Response, arrTags, Null ) %>