67 L78 Smog system
 

Hello all,

I’m looking for some help on a smog system for a 67 L78 car I’m working on.

Currently I’m installing the original engine and I’m having trouble trying to figure out the correct smog system layout. After searching online, I can’t seem to find any pics of one installed (at least on a 67) I can find 68/69 but not 67?

Thankfully the original owner saved all the parts he removed back in the early 70’s and I believe we have all the pieces.

After looking on the CRG site, assembly manual page 265, not a very clear diagram on how it’s mounted? I need to know how the adjustment bracket (belt tension bracket) is bolted up. I think it bolts to the water pump stud but something seems off, I installed it the same way the diagram shows but it don’t look right.

Anyone on here have any detailed pics of the pump mounted and also how the hoses are routed?

Any help would be much appreciated!

Thanks, Kurt

Not an L78 but factory 67 Fremont stuff for sure.
May be of some use??

Dave, thanks for the help, but that don’t really show what I was hoping.

Much appreciated though!

Kurt

‘

Not an L78 but if you haven’t seen them already, there’s some great Smog equipped ‘67 L35 pics further on in this 01/15 thread, also don’t miss Bruce’s Camaros.net link in Post 5 which has some great ‘67 L78 info, click here…
https://www.yenko.net/forum/showthread.php?t=130600
Best of luck w/ your quest!
:beers:
~ Pete

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Thank you Pete! I did see Bruce’s thread, much appreciated!

Pix from a '67 Chevelle L34. Note that the L34/L78 systems are quite different from the L35. Hopefully you have the pass side valve cover with the bracket.

Hopefully these are useful to you!

Oh my goodness!!! That's a work of art!!!

Found this digging for 212's.
Yours like this??

Pulley would be a key piece methinks.

pics for last post oooppppssssss

Guys, I can’t thank you enough for your help.

So here is my dilemma, I’m looking at the CRG site under 67 Camaro pulley configurations and according to that I have the correct pulleys for L78 w/smog.

3863108 Crank pulley
3906656 Water pump pulley
3880800 Smog pulley

The crank and water pump pulleys are 2 groove, with the smog pump mounted it appears it needs 3 groove pulleys on the crank and water pump in order to work? What as I missing here?

Also, when I bolt up the bracket that would tighten the belt, assembly manual shows it mounts from water pump stud to the pump, well when it’s mounted like that the Alt belt hits the bracket? The bracket I have (67 only I believe) looks to be correct according to the manual.

I’ve dug around quite a bit looking for info and pics for this setup and there is not much that I can find. 68 /69 much more info out there….hmmph….

Post pics

Pics showing bracket interference with Alt belt

‘

Is it possible the bar is indeed the correct part but bends were modified during resto/repaint? Of course you need to confirm w/ an actual L78 part to be correct, but comparing yours as immediately above w/ the L34 pics below that 67since67 shared in Post 6 also other from Bruce’s link, it looks like yours may work if flattened and both bends were re-bent at different locations further up, which may position the top adjuster bolt further along in the slot, but it appears to have enough slot length to offer?
Note specifically in the 1’st pic below, how close the upper bend is to the slot, also the second pic angle well shows how far upwards the lower bend is from bottom bolt, then compare where the two bends are w/ yours as pic above.:hmmm:
:beers:
~ Pete

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L78 Smog brackets...
 

My thought exactly...was going to post that but, it seemed too easy...good catch :biggthumpup:

Pete, I had thought about that possibility but I didn’t want to go ahead and rebend the bracket until I was 100 percent confident it was modified. The thing I’m having a hard time believing was why would anyone modify it? And the original owner removed the smog system early on when he started drag racing it. So unless I can compare this bracket to another 67 L78 car to make sure it’s correct I want to hold off on doing that.
The bracket in the pic you posted above is from a L34 I think and that bracket looks similar but the slot is much longer?
It would be awesome if there was someone on this site that actually had a 67 big block smog car that had the bracket and the pulleys so I can compare and put this to rest.
Really appreciate all the help here

‘

Yes, pics L34 as noted but all I’m saying is, the modifications may solve the immediate problem so you can move on w/ other things, then figure out what’s wrong later/bend it back if necessary?
AIM info as below indicates L35 & L78 used the same bracket # 3921935, also other info indicates it was superseded from 3886109, which may be what you have, AIM link here… https://www.heartbeatcitycamaro.com/...vP44rwX9riH7hK
Keep digging and best of luck!
:beers:
~ Pete

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Pete, yup I have the assembly manual and may have to do what you suggested. Looking at the pic in the manual, it has the short adjustment slot just like I have so I’m pretty convinced it’s the correct bracket.
I will keep digging thank you!

‘

Yes, AIM pic shows short slot but if drawing actually correct, note how close the upper bend is to the slot compared to top bend in yours, which is much further down.
:beers:
~ Pete

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Pete, yup I have the assembly manual and may have to do what you suggested. Looking at the pic in the manual, it has the short adjustment slot just like I have so I’m pretty convinced it’s the correct bracket.
I will keep digging thank you!