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Pontiac Forum: pontiac 1967 400CID manual engine rebuilding
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  #11  
Old June 25th, 2018, 09:19 AM
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I just wanted to confirm the year and the back is the easiest way to determine a 66 from a 67. I have seen some strange things happen with vehicles imported to other countries.
Interesting picture your GTO, a 442, and what looks like an American Indian teepee.
The production code D158 cannt be D156? I assume not since the block code 9790011 wasnt used for 67. Since Wallace and Butler deal with engine blocks all the time I was hoping they would know if there were any unusual combinations they have come across to help explain your findings.
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  #12  
Old June 25th, 2018, 02:11 PM
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Some strange cars I have seen in Europe was the reason Why I went to US to personally choose the car.
What I could not see was the engine inside :-)
All the other things are original.

The picture was taken 3 weeks ago on a gathering of US 900 cars. I found there this 4-4-2.
The production date is 99,99% D158 eventhough the D and 8 are bit worn out. If you look the last digit closer, you will see, that the missing curve is still noticeable.
The block number was not used any before 1968 (of course it could be 11/67 or 12/67 but it is not this case)

I have the first reply from Butler. But they also do not have the explanation for this unusual combination.

well.. at least I can go for 4,150 bore to match with butlers pistons.
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Old June 26th, 2018, 09:13 AM
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have you made any decisions concerning other components such as oil pump, I would recommend the Ram Air IV pump. How about the camshaft? Something similar to the 068 cam which was used on the Ram Air III and HO engines. I would not recommend the Ram Air IV 041 camshaft, too rough for a street driven car. Good luck with your project and keep us posted on it's progress.
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Old June 26th, 2018, 12:07 PM
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I am trying to communicate with Jim Butler regarding the engine set up. But we are at the very beginning.
Because I want to have a perfect setup, I have to have really lot of information.
(Are pistons T shaped? If yes (according to the picture it seems so) what about durability? what piston chamber to use? Standard or -3? or more?
According to that what camshaft and the compartment...
I send the pictures of the camshaft from my engine I can not determine.
Could you please look what it is?









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Old June 26th, 2018, 01:37 PM
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I have not come across the term "T" shaped piston before. I do know you want forged not cast and you already have the GM part number for what is in the car now. https://www.pontiacdiy.com/pontiac-v...ormance-guide/
CWC on the camshaft is Cambell, Wyant, and Cannon a foundry that made camshaft blanks for many different cars. The 540233, (that is the number?), is from a 61-62 389 Super Duty mechanical lifters. Scroll towards the bottom of this link
http://www.wallaceracing.com/camcode1.htm.

It really seems like somebody was trying to create a 421 type engine for your car.
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Old June 26th, 2018, 03:50 PM
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Standard piston looks like this



T shaped pistons are used mostly for racing purposes. They are lighter, have less momentum, allow higher revs, but their durability is almost mostly shorter, because they have often more play.
T shaped pistons look like this


Last edited by Dedek963; June 26th, 2018 at 04:29 PM.
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Old June 26th, 2018, 04:24 PM
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If I am correct, in the .txt file are now the cam I have in the car and 2 cams from GTO...
I am trying to resolve why my camshaft has been used.
...and simultaneously figure out what the numbers say.
Attached Files
File Type: txt camshaft.txt (406 Bytes, 20 views)
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Old June 26th, 2018, 04:24 PM
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that last image of the piston you wanted to post is not working
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Old June 26th, 2018, 04:29 PM
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better now?
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Old June 26th, 2018, 04:35 PM
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The only benefit of that cam appears to be more duration, lumpy idle, but it is a very old design. I'm sure Butler could recommend a camshaft but they need to know more information. What rear end gearing you have, mention the 4 speed, what type of driving, racing, cruising, intake manifold, carburetor, heads, any other modifications.
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