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MGB 79 MGB - restoring emissions controls

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BobS76

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Helping my son restore the emissions controls to his 79B so that he can get it registered in San Diego. The immediate problem appears to be the plumbing to the Gulp Valve. Apparently, there is a short piece of hose connecting one of the larger ports to a right angle fitting (Moss p/n 373-860) that installs in the manifold. Moss no longer sells this part but I found one on-line. Can someone confirm that the gupl valve is plumbed this way and let me know how the fitting installs in the manifold.

Thanks,
Bob
 
Last edited:
Thanks, that DOES help, but my main question was about the right angle fitting into the manifold. When I gave him the car, it had the 2 piece manifold and he sourced a reconditioned manifold with out the fitting.
 
For California, you will need the exact exhaust manifold. If I remember, BIG hole, 1" or maybe 7/8", and the boss for the hole wasn't there on pre-emissions vehicles, so you cannot just drill and tap a manifold.
Start asking and looking...and specify that 90 degree bit installed and intact. And NEVER try to remove one unless you are prepared to drill, grind and re-thread the manifold to get a new one in.
Yeah, you might luck out, but chances to well in favour of the house you will just snap it off.

And anti-seize everything.

Got the cat?
 
I worked on a 78 and had to buy a new cat to get the smog to pass. The new cat glowed red and caused vapor lock. Good luck.
 
and it is in violation of Federal Law to install a used cat. Period.
It really isn't worth the effort to try to get an old Brit vehicle to pass.
The law used to say, these are the minimums and maximums...unless it is British, and you have the importation paperwork from the Feds stating different numbers are allowable....and I never came across anyone with those papers.
We would fight those things for weeks with an analyzer hooked up and still couldn't get them to pass.
Get it out of state and sell it, buy one old enough it is not subject to emissions testing, and come back into the state.
Opinion.
 
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