What is the highest verified horsepower # on the stock NA cams? Today on Mike Carwins 94 NA-T we dynoed 758rwhp. This was done using the custom intake manifold that I built for it which dramatically improved the power output of the engine. Instead of the power dropping off after 5600 rpm the power now climbs all the way up to 8500. Im curious to see if anybody has any higher all boost #s on stock cams.