I have a small Summit cam in my 440 pickup and the bigger Summit cam in my 440 Valiant. Quality is excellent. I have been running both cams for 2 years now without a problem. The 440 in my pickup is a late model low compression engine and the small cam idles smooth and creates lot's of torque. The 440 in my Valiant has 9.25 compression and the larger cam pulls hard. I can't say anything bad about them and would gladly use them again.