Author Topic: Smog delete  (Read 1512 times)

Offline Twosquarebodys

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Smog delete
« on: July 30, 2022, 04:25:42 PM »
Is there a kit available for 86' LE8 smog removal (plugs, caps, and belts)? Or just old school and start removing everything. It's a manual so not too much to worry about beside a few vacuum lines. Keep on a trucking!!!!!!
87 R10 358 CID 700R4 <> 86 C-30 1 TON 454 W/NV-4500 <> 05 SILV 2500HD 6.6 DURAMAX/ALLISON

Offline Mike81K10

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Re: Smog delete
« Reply #1 on: July 30, 2022, 10:21:52 PM »
If it is all original and you are in a state that does inspections, you may want to keep as is unless there are problems. If running good, I would not mess with it unless you plan to rebuild.
"Tell me and I forget. Teach me and I remember. Involve me and I learn." -Benjamin Franklin

Offline Shifty

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Re: Smog delete
« Reply #2 on: August 01, 2022, 09:01:37 AM »
The only reason I'd do it, is because the smog (A.I.R.) pumps have become difficult to find, thus "saving" yours for the future!  :D
87 V20 Standard Cab Longbed (current)

87 R30 3+3 Longbed (days of yore)

98 C2500 ext cab longbed

Offline haroldwca

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Re: Smog delete
« Reply #3 on: August 01, 2022, 12:23:50 PM »
Iíve never seen a kit, but it isnít difficult to do it yourself. Iím assuming you donít need an inspection or you wouldnít be considering doing this.  Iíve  used JB Weld to block the AIR tube ports on the exhaust manifolds.  The myriad of vacuum hoses on the intake manifold will need to be traced to make sure you block off any openings to your engine vacuum.  Be sure to block off any open ports on your carburetor.  Auto parts stores sell vacuum port block-off covers.  Youíll have a much simpler looking engine bay, and chasing a vacuum leak will be greatly simplified.  Good luck!

Offline ehjorten

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Re: Smog delete
« Reply #4 on: August 02, 2022, 09:32:59 AM »
The "old" three-way plus air, catalytic converters needed air injected into the second half of the converter to support the chemical reaction of reducing the hydrocarbons, but newer three way catalytic converters liberate oxygen in the front half to support the second half reduction. This is why newer engines do not have air pumps. These types utilize an upstream O2 sensor and a downstream O2 sensor to monitor efficiency of the converter. You can run a modern three way cat without the downstream O2, but you should be running EFI if you do. I would assume if you are removing the air pump, you will remove the cat. Running the stock cat without air will be fine, but it will eventually get plugged up.
-Erik-
1991 V3500 - Gen V TBI 454, 4L80E, NP205, 14 bolt FF, D60, 8" Lift on 35s
1977 K20 Silverado - 350, THM350, NP203, 14 bolt FF, D44, Stock Lift on 31s
1969 Chevelle Malibu Sport Coupe - EFI350, THM350
1968 Chevrolet Step-side Pickup - 300HP L6

Offline Twosquarebodys

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Re: Smog delete
« Reply #5 on: August 12, 2022, 05:36:02 PM »
Going to rebuild sooner than later, she has 195,000 miles. She does not smoke or making any noise, so I would like to try and get some more torque before I tear it down. RV cam, headers with exhaust, dual plan intake, existing Rochester carb, and yes them existing peanut port heads, so all that smog dung has to come off anyway. I have no cats or any inspections hear on the east coast. But will hang on to them if anyone needs them. The build will be next year for torque only, so whatever HP it comes with, that's what it will be. Can't find a pulling block build without getting in to 600HP range, so local speed shop is almost 9 months out. Thanks for the info brothers! 
87 R10 358 CID 700R4 <> 86 C-30 1 TON 454 W/NV-4500 <> 05 SILV 2500HD 6.6 DURAMAX/ALLISON