Project: IRON STAGE 2

i remember your gs being gold at the old nats,i may be wrong but weer u a polie man? john sr,had an stok eletra,sorry my see key dosnt work

 

Yup, retired geez back in 2002. My GS over the many years was three other colors until I sold it. The last color was a '93 Corvette color Melon Metalic they only had it for 1 year for the Vets. Hell would I know it looks nothing like a melon lol , Also use to tow with a '73 Boat Tail Riv and then my '73 Centurion. Yeah John Sr had the Electra with a 455 implant towing. They were some great times at the GS Nats!!! Loads of great memories! Loads of great people!!

 

Now that's what I call towing in style.

 

Any updates on the cam being doctored by Mike?

 

Ah yes, here’s the print-out.

 

Thanks for posting the results. The crane blueprint stage 2 cam I just bought has the same specs.

 

Is that a common thing to see that much variation in duration numbers?
If so, what is the reason?

 

I would love to hear what the knowledgeable guys on here have to say about this camshafts numbers, Opinions welcome.

Are you referring to each lobe to the next or are you talking about overall this cam compared to other cams?
As for this cam and lobe to lobe it is a used cam so I would assume that may skew the numbers? Although the cam lobes don’t show any unusual wear on the lobes to the eye, but the Cam Doctor picks it up.
Maybe it’s a quality control issue, it was 1970, or using some logic since this was an experimental piece, maybe their O2 or whatever readings on rich/lean per cylinder during testing previous cams, and they were trying to compensate by adjusting the duration at each cylinder?
As for cam comparison to other cams, I think they were trying to use duration instead of higher lift to gain hp for durability maybe? This cam doesn’t have much lift.

 

You have to remember they were working with the parameters of the 68-69 400 cylinder heads non- stage 1 valves. They were too big for a 400 cylinder bore. Reason Buick designed the stage 2 head is because The engineers realize they needed a lot of help on the exhaust side for flow for the standard 400 cylinder head. That’s why you see so much in the duration numbers of the stage 2 cam. I don’t think Buick ever designed a cam for the iron head stage 2 head. If they did, it was never offered to the public.

 

If I understand you, what you’re saying is that you could not buy a cam along with the heads and pistons over the counter, the entire Stage 2 package?
The cam was designed for use only on pre-455 engines? I’m confused.
Or what you’re saying is the over the counter Stage 2 cam was designed prior to the 455?
If that’s the case, remember this cam is an experimental cam, my understanding was it was for the Stage 2 iron head, not before but after it’s development. Which falls inline with its numbers/specs being diffent than the one pictured here. I am confused

 

What I’m saying is when the stage 2 package came available late 68 - 69 there were no cylinder heads involved. It was the cam, high compression pistons, low tension, rings, special bearings, oil pressure, spring, early Holley B4B intake, 4781 Holley 850 for the 400. The stage 2 heads that I have weren’t available to the public till May 1972 because Buick was doing a lot of R&D on the heads in house a with Buick drag racers. In 70 Buick was still planning to produce the factory stage 2 race car. Buick had a casting issue with the stage 2 heads, a the feds stepped in for 71 and stop the program. With a compression drop.

 

I don’t know if they ever redesigned the stage 2 cam With the big bore 455 over 430/ 400. Next time you talk to Dennis Manor, ask him if they ever designed a stage 2 cam just for the 455 with the factory iron stage 2 heads.

 

Thanks, that clears it up for me. I understand better, Sometimes I’m not the sharpest pencil. I’ll definitely ask about it next conversation. He and Mike have been talking the last couple days about piston clearance and mains, on the phone how it was done back when, it’s not like modern stuff at all.

 

I’m sure if I wrote it it’s probably confusing lol

 

By the 4 numbers on your heads, did Dennis ever figure out where your heads were used first ?

 

He didn’t say, I wouldn’t think he would have all those in his head but maybe. Could have wound up with any number of people.

 

Another piece of the puzzle arrived, the correct Holley 850 DP 4781 with a date code of 1972. Looks nice and clean inside just cosmetically dirty, I’ll send it out for a full restoration. Thanks to Stage 2 Iron for giving me the heads up!

 

Nice ! I’m glad you managed to pick it up. You might be able to buy the correct parts for the choke from Holley The blade may be a little different that’s it.

 

I don’t need a choke and will probably cut-down the choke it’s just an air restriction anyway.

 

I would just leave your Carburetor alone and not cut it down. You’ll kill the value of it.
If I’m gonna get serious with mine, I’m just gonna put the quick fuel 950 on it