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Discussion in 'Engine Topic' started by ThomasD., Nov 21, 2017.
Sorry, messed up that last post.
So, the tubes aren't attached to the plugs? I'll need to really soak them then, cause the plugs aren't budging.
No the tubes come out. I removed all of mine and cleaned them up on a drill press and sand paper.
The AIR pump shoots air into the exhaust valves for pollution control. I had mine off from 1985 to about
2003. I never thought I'd ever install them back on. Luckily I stored all my Smog in a Box.
To help get the plugs out, heat the area with a propane torch and the shoot with PB Blaster. May have to do this a couple times. Then try breaking them loose.
I don’t think it’s the Holley’s fault Gary. The engines that came Holley equipped from GM were also very high compression compared to other production engines and had high lift cam shafts...none of which is conducive to hitting smog numbers.
As mentioned above, probably a service replacement. I’d hang on to them given your car’s unique history in your family. Close enough to original and part of your car’s story.
My 69 Z had plugs installed when I bought it in ‘84. Eventually I sourced the whole AIR system and went about setting it up. The plugs were in there good but finally gave up the fight and let me remove them. The problem was that some of the threads in the manifold had eroded and would not seat the AIR the fittings. Hopefully yours will be more cooperative.
When and if you remove the smog tubes and plan to replace them...make sure you keep the originals for measuring the length.The NOS ones are too long and will need to be cut down.
So The tubes are protruding through the manifold into the port and plugs are installed on this factory LT-1 manifold. Was this the way they came from the factory? Were these the same manifolds used for the base 350 that had the AIR system installed? Just seems odd to
Have that obstruction in the port of a ‘performance’ engine.
Here's a nice explanation from SuperChevy....
Any car that came with A.I.R. got them. Why is this hard to believe? 68-69 Z/28's had them too. Same with Chevelles.
70 LS6 Chevelle