To chime in on what David said, In the late 60's and early 70's, I worked at a chevy dealership. I rebuilt and installed a lot of engines and short blocks. During this same time, i was also building quite a few race engines. I must say, I have NEVER had a cam go flat. I can't contribute it to any one thing or any specific cam. I cannot say I never made a mistake, as I am the KING of crossing plug wire #5 and #7. All in all, All my engines had one thing in common. Each engine I did had a can of EOS in it. Whether it was a dealership job or a race motor, none ever went out the door without EOS. I was taught (by the best mechanic I ever knew) to add it and I did. I learned very on in my career to never question my mentor. Rest in peace David.