Another Photo
Here's another:
Here's another:
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In Appreciation of John Hinckley -
Re: And a Final Photo
I had to go get a towel to dry my eyes out,
The diverter valve is very nice like new nice like I like nice!!!Comment
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Re: And a Final Photo
Michael-----
It looks new because it is new. At least, it's new in the sense that it's never been used. It's old in the sense that it's about 37 years since it was manufactured.In Appreciation of John HinckleyComment
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Re: 68 smog 427/435 C_3
Joe, can you share the reasons on why you DO NOT recommend making a smog system dis-functional? RayComment
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Re: 68 smog 427/435 C_3
Ray-----
Many reasons:
1) The gain in horsepower with the pump inoperative is minimal;
2) Old cars make a lot of exhaust fumes. Once-upon-a-time, we were "used to" this so we didn't notice it so much. Now, we're not so used to it, so it's much more annoying. With an inoperable AIR system, especially with a convertible with top down, you will notice way more exhaust fumes than with the system operational. I always had the AIR system operational on my 1969. One nice, summer, top-down day, the pump seized (not the original pump) and the fan belt broke. After the smoke cleared, I pulled the remnants of the belt off and felt lucky that I could continue my drive because the AIR pump was not really necessary for vehicle operation. IMMEDIATELY afterwards, I noticed WAY more exhaust fumes in the car. Very, very annoying and "stinky". I could not wait to get home and replace the pump;
3) It's against federal law to make the system inoperative or fail to maintain it. It does not matter if you live in an area with no emissions inspections. It's against the law anywhere in the US or its territories. Fine is $10,000. Chance of being caught, of course, is slim to none. Nevertheless, it's a hefty fine if the EPA decides to get serious;
4) In areas where emissions testing is required, either periodic or at time of sale, the car won't pass, either the visual test or the tail-pipe test;
5) It's environmentally irresponsible. Want to give environmentalists all the "ammunition" they need in the future to impose draconian measures on older, higher polluting cars? There's no better way to do it than disable factory-installed emissions systems and have that discerned even in a non-regulatory audit. Think that the USEPA doesn't do these sudits? Think again;
6) An inoperative AIR system is easily discerned in a PV inspection, assuming the judge knows what he's doing. It might also be discernable in a Flight or Bow-Tie judging.
Thats enough for now.In Appreciation of John HinckleyComment
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Re: 68 smog 427/435 C_3
Joe
I'm glad that I have the GM Big Block injector tubes for in the exhaust manifolds.
I jest, really need to BORROW your diverter valve..................
Ok Ok I'll make her legal.
Besides all that crap under that hood in dated correct order has to be at least an ataboy
But thanks for all the info and help
Its been fun
Happy Holidays
MichaelComment
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Re: 68 smog 427/435 C_3
Hi Micheal
I don't know what your assembly date of your 68 435hp is but if you have a very late 68 435 you can use the same diverter as Joe has shown. If you have a 68 435hp car then you need the diverter that has a V shaped clip that is braised to the diverter muffler. I just sent a Sept or Oct smog set up for an early 69 L71 built in Sept or Oct of 68 and it does not have the relief valve. I sold the set up 2 years ago and finally had the time to have it restored. Email me grantwong@telus.net and I'll send you pics of the smog set up and a pic of the original diverter twist bracket that you talked about. Thanks, Grant
PS Joe..... I wanna go for a ride in your ZL1....I'll bring some nice fresh mussels and clams(drooling?).....well none that are local due to snow. But I'm sure they taste good cooked with garlic and pine nuts. I think you mentioned you liked clams??Comment
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Re: 68 smog 427/435 C_3
Michael------
You can make up a FUNCTIONAL, if NCRS-incorrect, system using parts that are a bit easier to obtain. For example, you can use the 68 or 1969-75 pump, either of which are fairly easy and cheap to obtain. Then, you can use the elbow you have with the 1972-73 style diverter valve. These can be difficult and expensive to find, but they're not as difficult as the 68, 69, or 71 valves. There was also a GM plastic replacement for the 73-74 valves once available under GM #17084844. It's discontinued, but you may find them pop up on eBay from time-to-time. They usually go cheap because everyone "in-the-know" knows that they're not original pieces. And, they're right; they were not used in PRODUCTION for any big block. However, they are 100% functional and they're adaptable to earlier applications.In Appreciation of John HinckleyComment
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Re: 68 smog 427/435 C_3
Grant-----
First, I need to get the car on the road. Then I'll be able to give rides.
Yes, I definitely DO like clams-----especially and in particular New England steamer clams. These are the finest tasting clams to be found anywhere I've been. Period.In Appreciation of John HinckleyComment
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Re: 68 smog 427/435 C_3
I just had brain Fart!! The diverter for your 68 435hp is a 296 as Joe described. I was describing an early 69 298 diverter. So you don't need my pics. You need the one that Joe has described. I do have a few tucked away. I just have to find them. I'm not well organized as Joe is.
Hey Joe!! When it warms up her let me figure out how I can send you some Mussels and Clams. THere must be a way so they'll still be alive when it gets to your house. TTYL. GrantComment
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Addendum
Also, I'm not familiar with the valve you describe for 1968 L-71. The only valve I'm familiar with is the 7028296, as-pictured. Supposedly, early 1968 may have used valve GM #3920990. However, I always thought that was just a Chevrolet part number for the Rochester GM #7028296 and not a different valve. It's possible, though. In any event, the 3920990 was never available in SERVICE and there shows no predecessor part number for the 7028296.
The configuration you describe with the "V"-shaped support clip brazed to the muffler I have seen on some 69+ small block valves, especially Z-28. However, these valves have crimped-on mufflers which lend themselves to the "V" support clip. I do not see how this would work with the removable and replaceable mufflers found on 1968 models.In Appreciation of John HinckleyComment
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Re: 68 smog 427/435 C_3
Joe
wow
Thats what i need to know for now! Big Info.........
BUT NOW EVERYONE KNOWS.............
I jest........... jest want to borrow that diverter valve,,,,,,,,,,,
Thats really great info for all on that air system
Thank you
MichaelComment
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Re: 68 smog 427/435 C_3
Joe
Whats the numbers for the 72 73 diverters
Thanks
MichaelComment
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Re: 68 smog 427/435 C_3
Mark-----
GM #7029190.In Appreciation of John HinckleyComment
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Re: 68 smog 427/435 C_3
Grant
well dude, how about a little digging for me?
See what ya got and let me know.
And Grant you know some paper soaked in saltwater wrap them little clams in that there paper iceing each layer in a wax cardboard box!shipped overnight! they will make it so ya better get keyholeing cause I figure you need at least 4 dozen and thats just for Joe.............
Good to hear from ya
MichaelComment
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