Re: Valve Spring Pressure - BBC stocker
 

Your guides are tight when you put heat in the thing. Mic your stems then ream guides with a reamer .0025-.003.

Re: Valve Spring Pressure - BBC stocker
 

Just my 2 cents, based on personal experience.
I too, have been victim of this very same issue... difference being, I didn't learn after the first time it happened. Took two more incidents... which is why I haven't been on a track for almost 6 years.
in short
After providing my lobe number to my Comp Cams rep... his response:
"YOU CAN'T REV THAT LOBE" !
me:
"THAT'S WHAT I'VE BEEN TRYING TO TELL YOU" !

Yes, there ARE lobes that can't be controlled at RPM... "torque lobes", as they were described to me.

Re: Valve Spring Pressure - BBC stocker
 

I remember trying to work with you on that.


And that was my first thought on this thread.

Re: Valve Spring Pressure - BBC stocker
 

Yes, Alan... and you definitely DID help !
I went with spring specs you recommended, and actually designed my own intake lobe variation of what I had.
All good now, and seems to run better than it ever did.