Converting non-SMOG to SMOG manifolds
 

Hi everyone.

I want to start off with a comment about the following post.
I have been criticized for posting a topic here as well as
on other forums in the past. I do this because I am trying
to reach as many knowledgeable people as I possibly can. If
my "double posting" offends anyone, please let me know. https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Do any members here have any experience with getting non-SMOG exhaust manifolds
drilled & tapped ( properly ) to use with factory SMOG equipment? I have been
hunting the proper dated manifolds for quite some time now. I did find correct
dated non-SMOG manifolds ( which I bought as a backup ). Now, I am faced with
the prospect of getting these manifolds drilled & tapped for the SMOG ports.
I can certainly contact machine shops to do this, but centerline dimensions are
fairly important I would think. Furthermore, the configuration of the actual
ports are also important. I only have one shot at this, so perfection is the
order of the day. To that end, does anyone have a recommendation for a shop
that has done this type of work before? I don't want to learn the hard way. Also, I have been given conflicting
information on the actual tap size used for the SMOG ports.
What is the correct tap to use?

I would prefer to work with a shop that has this experience under their belt. https://www.yenko.net/ubbthreads/imag...s/headbang.gif

Steve

Re: Converting non-SMOG to SMOG manifolds
 

Sounds like it should be possible with a good machine shop, and a set of smog manifolds and tubes for a pattern. I'll bet GM drilled and tapped them after they were cast. I will ask around tomorrow if any of my local boys know someone who can do this. If there is, I also need a set done!

wilma https://www.yenko.net/ubbthreads/imag...mlins/flag.gif

Re: Converting non-SMOG to SMOG manifolds
 

Steve...I would contact someone like Jerry MacNeish or Bill Hodel. They do a lot of smog system work. They should be able to help, or even do the job for you. Good luck.

Re: Converting non-SMOG to SMOG manifolds
 

Great idea! Anyone got a number or email address for
Bill Hodel?

Steve

Re: Converting non-SMOG to SMOG manifolds
 

330 832 0781..according to his ad in Hemmings.

Re: Converting non-SMOG to SMOG manifolds
 

Thanks Tony.

Steve

Re: Converting non-SMOG to SMOG manifolds
 

I just recently saw a pair of non-smog that were converted to smog manifolds. This guy does them in a fixture in a CNC machine. You can not tell when there done. Looks like the factory did it. Takes at least 4 different tools to do it correctly. PM me if you want him to do yours. Guaranteed perfect.

Re: Converting non-SMOG to SMOG manifolds
 

Kevin,

I sent you a PM on this subject, I hope you got it.

Steve

Re: Converting non-SMOG to SMOG manifolds
 

I know Chris White provides this service as well.

Re: Converting non-SMOG to SMOG manifolds
 

Steve, I will get in touch with you via email.Thanks, Kevin

Re: Converting non-SMOG to SMOG manifolds
 

I've had several people PM me about getting BBC exhaust manifolds drilled and tapped for AIR (smog). If anyone else needs this done I would like to do them around the same time if possible or in groups of at least four manifolds. This way we can save set up time on the CNC machine. Pm or email [email protected] Thanks, Kevin

Re: Converting non-SMOG to SMOG manifolds
 

Kevin,

Please don't take this the wrong way. This is a one way
deal for my manifolds as well as many others here. Is there
any way for us to be sure the SMOG port machining will be
done correcly? I would actually like to opportunity to
talk to the machine shop owner if that could be arranged.
I've been looking for Oct. 68 manifolds for five years and
I don't want anything bad to happen to them. I just want
to be careful and do my up-front research. Can you get me
a phone number? https://www.yenko.net/ubbthreads/imag...lins/dunno.gif

Steve

Re: Converting non-SMOG to SMOG manifolds
 

Steve and others wondering what will happen to your manifolds....The machine process will not damage, distort or scratch your valuable exhaust manifolds. They may get wet from the coolant used in a CNC Lathe, but that's all. Your manifolds will look exactly like the factory did it. I have seen this process done and you can't tell if it was done 30 years ago or today. Looks absolutley like GM did it. Your AIR tubes will screw in like original equipment in the exact same spot. CNC (Computer Numeric Control) drills in the exact same spot every time. Threads will be perfectly straight every time. What else can I tell you? Manifolds have to be shipped to me in NJ. Any questions on prices or technical info, please email me at [email protected]