Not sure what the peak hp is for a stock intake if any, but I tried running a stock intake modded in every way possible using a qjet and 1” spacer. At the end of the day there was no point whatsoever, the rpm was simply better. At around 500+ hp at the time. . Will they work at higher hp levels ? Sure, just not worth the effort in my book, unless you have good reason.
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71 GTO, 463, KRE 295 cfm heads ported by SD Performance, RPM intake, Qjet, Dougs Headers, Comp cams HR 246/252 ...11 to 1 , 3.55 cogs, 3985lbs.....day three- 11.04 at 120mph ....1.53 60', 6.98 1/8 mile
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