[Keithc8]

Being a flat tappet makes a difference because you will loose effective duration and lift with the lash. It depends on which lobes that you use as to what the lash will be. You can normally deduct about 6 to 10 degrees with a flat tappet to make it the same as a hydraulic because there is no lash. So that would put my flat tappet at about 248 to 250 intake and about 256 to 258 on the exhaust. The lift of .660 would also become more like .630 to .640 with the lash and pushrod flex. Good luck, Keith