"Old School" Stocker Cams

Terry Cain · 12-28-2019, 11:08 AM

Quote:

Originally Posted by impstocker

I was reading the Jr. Stock book by Doug Boyce and came across where a guy went down to Lunati's shop to pick up a Stocker cam for his 56 Chevy M/SA car and how the Lunati cam really woke up the 265 and how he was able to run under the record with it.

Having somewhat of a idea on how the old Stock duration and stock lift cams worked, I would like to hear more about how these camshafts worked including with the stock valve spring rules?

This is just for winter discussion fun..Thanks !

Will Lamprecht
65 Impala 396/325
Have Jerico for it.

They actually checked lift and duration. Also checked springs.

Billy Nees · 12-28-2019, 12:34 PM

The best cam that I ever had in my 307 Chevy was an old CamDynamics Jr. Stock cam. As best I can remember it was a 929-G.

ss3011 · 12-28-2019, 03:40 PM

Also part of the spec was "checking clearance" The duration was measured after the lift at the valve hit the opening checking clearance then finished when the lift was at the closing checking clearance . It was good to have" big" checking clearances sent in by the factory . Overlap was checked the same way . NHRA tech had a really trick Degree Wheel that simplified the checking process .

Ed Wright · 12-28-2019, 04:49 PM

Our Div 4 head tech inspector, Red Anderson, was also a good machinist. He made, and sold a really trick degree wheel.
I had one of those Lunati Jr Stock cams in my ‘56 when I set one of my records. During tear down Red told me “this thing does hit the numbers, but the ramps are way fast. I’m going to pass it this time, but we both know it’s wrong. I don’t want to see it again.
Ran just as fast with a Cam Dynamics, which Red liked better next time he tore me down. The Lunati looked like a roller cam. Almost square lobes. LOL

SSDiv6 · 12-28-2019, 06:37 PM

The "square lobe" cam profiles are known as "dwell" lobes. With a dwell lobe, you can basically put a lifter on top of the lobe and it will not fall off!

Don Teweles at General Kinetics, along with Joe Lunati were pioneers on dwell lobe Stocker camshafts in the early days. Cam Dynamics also created many Stocker dwell cams that were crazy fast too.

After Don shuttered General Kinetics, my preferred brand was Cam Dynamics when Glen Steyer's was still at Crane Cams.

Let's not forget that in the early days, although they checked duration, lift and overlap, the OEM's had submitted some crazy camshaft specs too, especially regarding overlap.

impstocker · 12-28-2019, 07:22 PM

Quote:

Originally Posted by SSDiv6

The "square lobe" cam profiles are known as "dwell" lobes. With a dwell lobe, you can basically put a lifter on top of the lobe and it will not fall off!

Don Teweles at General Kinetics, along with Joe Lunati were pioneers on dwell lobe Stocker camshafts in the early days. Cam Dynamics also created many Stocker dwell cams that were crazy fast too.
.

I am confused? The cam in my 396/325 BBC has that "'square lobe" being only a .398 lift cam too. Isn't that due to the duration in the cam? So if you had too use Stock durations back then..how could they have square lobes? I was thinking they changed the LSA from stock for more overlap..

Bob Mulry · 12-28-2019, 07:35 PM

Quote:

Originally Posted by impstocker

I am confused? The cam in my 396/325 BBC has that "'square lobe" being only a .398 lift cam too. Isn't that due to the duration in the cam? So if you had too use Stock durations back then..how could they have square lobes? I was thinking they changed the LSA from stock for more overlap..

Lift stays the same it just gets to max lift quicker and stays there longer until it slams back down on the seat....

sammy pizzolato · 10-27-2020, 06:54 PM

Quote:

Originally Posted by ss3011

Also part of the spec was "checking clearance" The duration was measured after the lift at the valve hit the opening checking clearance then finished when the lift was at the closing checking clearance . It was good to have" big" checking clearances sent in by the factory . Overlap was checked the same way . NHRA tech had a really trick Degree Wheel that simplified the checking process .

i have one of those NHRA checking wheels. Mr Red Anderson built them for nhra and i was luckey enough to talk red into making one for me.and i still have it today.it's priceless!!!!!!

Ed Wright · 10-27-2020, 07:09 PM

Quote:

Originally Posted by sammy pizzolato

i have one of those NHRA checking wheels. Mr Red Anderson built them for nhra and i was luckey enough to talk red into making one for me.and i still have it today.it's priceless!!!!!!

I still have mine too. And his Deck Checker, uses a dial indicator.

Frank Castros · 10-27-2020, 07:28 PM

Quote:

Originally Posted by Ed Wright

I still have mine too. And his Deck Checker, uses a dial indicator.

Great thread!

12-28-2019, 12:34 PM	#2
Billy Nees VIP Member Join Date: Oct 2002 Location: On a hilltop in Pa. Posts: 4,485 Likes: 3,587 Liked 7,682 Times in 1,730 Posts	Re: "Old School" Stocker Cams The best cam that I ever had in my 307 Chevy was an old CamDynamics Jr. Stock cam. As best I can remember it was a 929-G. __________________ Billy Nees 1188 STK, SS I'm not spending 100K to win 2K

12-28-2019, 03:40 PM	#3
ss3011 Senior Member Join Date: Feb 2002 Location: Southeast Michigan Posts: 909 Likes: 70 Liked 239 Times in 114 Posts	Re: "Old School" Stocker Cams Also part of the spec was "checking clearance" The duration was measured after the lift at the valve hit the opening checking clearance then finished when the lift was at the closing checking clearance . It was good to have" big" checking clearances sent in by the factory . Overlap was checked the same way . NHRA tech had a really trick Degree Wheel that simplified the checking process .

12-28-2019, 04:49 PM	#4
Ed Wright Veteran Member Join Date: Mar 2005 Location: Sand Springs, OK Posts: 8,132 Likes: 896 Liked 390 Times in 170 Posts	Re: "Old School" Stocker Cams Our Div 4 head tech inspector, Red Anderson, was also a good machinist. He made, and sold a really trick degree wheel. I had one of those Lunati Jr Stock cams in my ‘56 when I set one of my records. During tear down Red told me “this thing does hit the numbers, but the ramps are way fast. I’m going to pass it this time, but we both know it’s wrong. I don’t want to see it again. Ran just as fast with a Cam Dynamics, which Red liked better next time he tore me down. The Lunati looked like a roller cam. Almost square lobes. LOL __________________ Ed Wright 4156 SS/JA

12-28-2019, 06:37 PM	#5
SSDiv6 VIP Member Join Date: Feb 2003 Location: Glendale, Arizona Posts: 3,041 Likes: 712 Liked 1,575 Times in 580 Posts	Re: "Old School" Stocker Cams The "square lobe" cam profiles are known as "dwell" lobes. With a dwell lobe, you can basically put a lifter on top of the lobe and it will not fall off! Don Teweles at General Kinetics, along with Joe Lunati were pioneers on dwell lobe Stocker camshafts in the early days. Cam Dynamics also created many Stocker dwell cams that were crazy fast too. After Don shuttered General Kinetics, my preferred brand was Cam Dynamics when Glen Steyer's was still at Crane Cams. Let's not forget that in the early days, although they checked duration, lift and overlap, the OEM's had submitted some crazy camshaft specs too, especially regarding overlap.