Could the other 283 cars been tested on a different day or with different people in the car that weighed different than the 230 test? I believe that I read somewhere that member Tlowe has a car with a hi perf 230 in it. I would love to know if the exhaust system is different and cam specs. Is the air cleaner the same? 6% is 7-8 hp. Could be underrated by Chevy to not get too close to the 283 2bbl rating? Could also be the Crome. Jay 6155
