I have the small thumpr flat tappet cam in my mild 350 with rhs 1.94/1.5 vortecs. it is all the cam you can stand in a daily driver. it is even kind of a pain in the ass with my 6 spd and 3.73's because it wants to buck the car at light load cruising. it runs and sounds great, but I would not recommend the larger thumprs unless you have 400+ cubes.
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