I’ve heard that. That’s why I bought them from a expert. My machinist recommended Morrels and I did not go with them. I figure it’s the ramp speed of the cam on this profile. I was taking a buddy of mine for a ride in the car and he mentioned his 340 flat tappet hyd motor made racket with roller rockers. He uses ray Barton cams. The customer doesn’t mind. His other car is a stock 68 hemi RR. It makes noise for sure. The car runs great and that’s the main goal. It has great vacuum at idle and low end is real good, giving it great drivability for street car.