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Old 12-22-2021, 04:16 PM   #1
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1986 34.5' Airstream 345
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smog plugs exhaust 454

I'm trying to plug the exhaust manifold smog fittings and can't seem to find the correct thread to do so. any suggestions.

thanks, Bill
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Old 12-22-2021, 04:27 PM   #2
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Smog plugs?????

Are you referring to the oxygen sensors or manifold air pump fittings?
If so what's the purpose?
You could just leave them installed and unplug them.

Are you fuel injected, air pump, carb Do you have a throttle body FI. A computer?

Too many things to work around, just removing the smog stuff may not improve anything.
You may need a more holistic approach.

I did it with a Banks Power and pack and chip programmer for our '95 Suburban's 454 throttle body injection, but that was 19 years ago and I'm not sure that any such equipment is still available.

Bob
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Old 12-22-2021, 04:35 PM   #3
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Bill, check this out - looks like what you’re looking for.
https://www.ecklers.com/camaro-exhau...-182656-1.html
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Old 12-22-2021, 06:44 PM   #4
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454 mods

Tell us what you're trying to accomplish with your 454. Increase performance? Frozen smog pump and just want to eliminate rather than replace? Give us a clue and forum can respond. I am an old school drag racer that beat heavily on more than one 454 so I can give some insight on how to give your 454 a lift. Oh, what is the budget? More performance means more $$$$.
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Old 12-22-2021, 07:47 PM   #5
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Crate motor option?

Wondering if anyone would consider Chevy’s latest crate motor as a retrofit?

Most powerful naturally aspirated engine they’ve ever built - 1004 HP and 876 lb.ft of torque. Almost three times the HP of my ‘69 SS396\375HP Nova (wish I had that one back) Not too shabby!
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Old 12-23-2021, 10:43 AM   #6
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Originally Posted by jeffmc306 View Post
Wondering if anyone would consider Chevy’s latest crate motor as a retrofit?

Most powerful naturally aspirated engine they’ve ever built - 1004 HP and 876 lb.ft of torque. Almost three times the HP of my ‘69 SS396\375HP Nova (wish I had that one back) Not too shabby!
That would make for a very fast AS Motorhome!! Of course, when you have major power increases the remainder of the driveline has to be upgraded. The OP may just want a reasonable HP to make the driving experience a bit better. Looking for OP to post what the goal is.
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Old 12-23-2021, 10:49 AM   #7
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Agreed…. Tongue was firmly in cheek on the post. It’s pretty amazing what’s available today compared to the smog engines of the mid-late 70’s.
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Old 12-24-2021, 10:29 AM   #8
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Thanks everyone, Manifold air pump fittings, carburetor, I considered headers currently just trying to quiet and seal the exhaust. some items were removed before I received it. I ordered the Camaro plugs they're too small. Size is close to 1/2/ pipe but it's not pipe thread. Measures 7/8. I still have some of the parts and I see the argument environmentally for putting it back together, I'm Not sure where I'm going with this project, runs great currently.
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Old 01-16-2022, 07:42 AM   #9
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I disconnected our rusted out and leaking air injection tubes. Was able to plug the air injection ports with metal plugs (not brass) found in hardware store;plumbing dept. think they were 1/4”

Used exhaust leak paste as thread sealant, and good snug hand tight. They have remained in place after 10k miles
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Old 01-28-2022, 10:07 AM   #10
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Exclamation 632 as MH engine

Quote:
Originally Posted by jeffmc306 View Post
Wondering if anyone would consider Chevy’s latest crate motor as a retrofit?

Most powerful naturally aspirated engine they’ve ever built - 1004 HP and 876 lb.ft of torque. Almost three times the HP of my ‘69 SS396\375HP Nova (wish I had that one back) Not too shabby!
If you limited this to about 4500 RPM max you would probably be OK for using it for a RV engine. They may offer the same engine in RV tune with a HD cam that makes the power down where you need it for a large vehicle. 500 ft lbs at 2000 RPM is about as good as a diesel, and more than enough to break a lot of driveline parts if you don't be careful.
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Old 01-28-2022, 10:10 AM   #11
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The idea of having to run premium gas in an RV just makes me cringe with fear. ;
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