I have bad news, thoese springs will not cut it!the f246 has about 0.570 lift after lash, your springs are at max@0.550 with not enough pounds.what i would do is get some +0.100 valve spring retainers and m/c valve locks and some k-motion 800 or iskey 8005 springs. you should m/c for double springs and teflon seals.set them up with 145 on the seat then remove the inner for running in.the f246 will make power from 2800 to 6250 when setup @+4 deg .and will rpm 3200 to 6500 rpm when set up by the book.IT feels GOOD!if the car is set up ,and you can shift gears you will run in the hi 11s but you must have a good fuel pump, thoese mcrob pumps work well ,a friend has one on his f246 combo
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