289 California Smog Head - Ford Muscle Forums : Ford Muscle Cars Tech Forum
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post #1 of 2 (permalink) Old 02-19-2009, 06:57 AM Thread Starter
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289 California Smog Head

I have a question I hope someone can help with.

I have an all stock 1967 Mercury Cougar with a 289. It is a California car that has A/C and the air injection/thermactor system and misc. smog equipment. I am currently removing the A/C (non functional) and the smog equip. to clean up the engine compartment.

Each head has only one hole on the exhaust side (not the ends - which is much more common) for the air injection tube. The hole not threaded and is .850 inches in diamater. The smog 'cup' (which has the air injection tube attached to it) has a bolt (5/16?) that threads into the head to keep it all attached. Because the hole is a different size than more common thermactor ports on the ends of Ford heads, the thermactor plug fix will not work or fit. My research shows this head smoq set-up to be somewhat unique to the 67 California 289 head.

Has anyone plugged this hole and what did you do it with? It looks like I could use a freeze [core] plug if I could find one the correct size. Ford does not have anything to plug it with - I checked already. I may just get a thick washer that's slightly larger than the hole and screw it in using the bolt and some hi-temp. silicone or epoxy to keep it sealed. Just wondering if anyone has any better ideas for a cleaner way to do this. I can snap some photos of the head/hole if anyone wants to see it (or has never seen such a thing).

Thanks in advance.
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post #2 of 2 (permalink) Old 02-22-2009, 08:20 AM
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Re: 289 California Smog Head

Yes I have done just that use a large washer cut my own gasket put copper hi temp sealer and go no leaks for a year and a half then pulled motor
Ace hard ware has a very good asormant of washers

Last edited by Booze; 02-22-2009 at 08:22 AM. Reason: thought of some thing else
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