[k.c.]

I searched for the answer to this but got mostly info on high performance cams.

Is it necessary to remove the inner springs for break in on a stock 1960 389? I'm guessing that the factory did not start new engines with outer springs only for break in, then go back and add the inner.

Thanks in advance.

[61-63]

I am no expert at this but I have broken in both an 068 and a RAIII cam within the past five or so years and did not remove the inner springs. I just put lots of GM assembly lube, and what came in the box with the cam, on the lobes, etc., made sure the distributor was clocked before startup, and then ran the cams at 2000rpm for 20 minutes to break them in, and neither cam has gone flat. I don't remember what the spring pressures were probably 110 or so seat and 285 or so open? I'm not a racer.

[Ron Landis]

that is for racing engines with extreme pressure....triple springs and such. No need on a mild street engine....but following the guidelines is absolutely critical! Good luck. Ron

[k.c.]

Thanks guys. That kinda makes sense.

[RamAirIV28]

some sources say to run it at about 2000 to 2500 RPM for 20-25 minutes. If you shut it down for any reason, that's ok just once you get it back up and running take it back up to the 2-2500 rpm again.