I have had several of these new style Hyd flat tappet cams, sure they run OK but the valve train noise is horrible...
I know they recommend adjustable valve train in most case's but this doesnt help.. FACT..
Simply put, take a stock low mile engine with ZERO valve train noise add some old Ductile Iron Isky rockers and you now have a cam that sounds like s solid lift version...
Most shrug the noise off with a answer "Its the nature of these Cams"
Bull crap..
Or
"all these large cams do that"
Bull..
The last MP 509 Hyd cam I installed on a 493 RB engine with Edelbrock heads was quite as a mouse.
Problem is this cam I put in the car, sounds worse than a MP 590 cam with .035 inch lash LOL.
So what gives? why do these cams do this? I have had 3-4 cams do this in the past 10 years... Three have been COMP Cams, One was a Lunati bracket Master from personal experience..

[color:"red"]65 Hemi Belvedere coming soon [/color]
[color:"#00FF00"]557" Indy engine 1.07 60ft 144mph in the 8th 2100 lbs package [/color]