Re: High Engine RPM Weakest Link
 

Share with us wilma. I would like to know what is being run today .I know what we ran years ago with the zl-1 cam in the l-72 and like Keith I never lost one. Only BBC I blew up was one of those black crate ls-6's and it was my fault for not talking it apart prior to racing it.

Re: High Engine RPM Weakest Link
 

We used L88 springs although there may be better springs available. I doubt that an L72 or L78 were turning their best ets at rpms over 6K anyway. A friend's L78 with flow benched heads, and a better cam turns its best ets shifting at 6K. Over or under and his times suffer. Take it for what it's worth. Our L72 saw 7200 a couple of times, so these engines certainly are capable of the rpms. Time slips tell the real story. Most people might be very surprised at their ideal shift point.

Re: High Engine RPM Weakest Link
 

Sorry: I misunderstood the question. I thought we were talking about a Hot rod motor.Valve spring pressure is a major problem with BBC. too much pressure and you roll a lobe too, little and they won't run.