Valve Spring Pressure - BBC stocker - Page 4

Daran Summerton · 07-02-2018, 08:25 PM

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

Aubrey N Bruneau · 07-03-2018, 10:40 AM

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.

Alan Roehrich · 07-03-2018, 06:43 PM

Quote:

Originally Posted by Aubrey N Bruneau

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.

I remember trying to work with you on that.

And that was my first thought on this thread.

Aubrey N Bruneau · 07-03-2018, 07:51 PM

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.

07-02-2018, 08:25 PM	#31
Daran Summerton Senior Member Join Date: Jun 2003 Location: Las Vegas nv Posts: 598 Likes: 18 Liked 65 Times in 36 Posts	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. __________________ 72 cutlass

07-03-2018, 10:40 AM	#32
Aubrey N Bruneau Member Join Date: Sep 2003 Location: South Eastern Alberta, Canada Posts: 311 Likes: 6 Liked 7 Times in 3 Posts	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. __________________ Aubrey N Bruneau 6409 C/S 62 BelAir sport coupe, 409 HP 409

07-03-2018, 07:51 PM	#34
Aubrey N Bruneau Member Join Date: Sep 2003 Location: South Eastern Alberta, Canada Posts: 311 Likes: 6 Liked 7 Times in 3 Posts	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. __________________ Aubrey N Bruneau 6409 C/S 62 BelAir sport coupe, 409 HP 409