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68C15
12-21-2005, 07:17 PM
my engine is what I think to be a 68 472. it came with an AIR pump mounted on the front. I see no signs of any place where it was plumbed into the heads or manifolds. I do see small holes in each exhaust port though. both heads have a flat plug on both ends of what appears to be some galley in the casting. anyone have pics of what this system looked like or some insight?
DV8
12-22-2005, 11:16 AM
I have no pictures, however it sounds like someone removed most of your system and was using the pump as an idler for the accessory drive belt.
Nashalac
12-22-2005, 01:15 PM
What he said
STDog
12-22-2005, 02:21 PM
Somebody posted some engine picture on CB7 recently, and at least one of them had the A.I.R system intact.

Unfortunately I cannot find it now :(

Anyone remeber the thread or poster?
Terrible One
12-23-2005, 11:21 AM
I can't remember the thread either, but I saved the picture. That is, if this is the one STDog was referring to.

http://img268.imageshack.us/img268/1802/enines2pj.jpg (http://imageshack.us)
STDog
12-23-2005, 11:29 AM
That may have been it. The one in the back right liooks to have it all.

I guess I need to borrow a shop manual for a year that had it. I know somone with the '68 manual. Post scans of the description. Probably find an engine pictue in it too.

The description may not help much though. I know the description of T.C.S. in the '70 manual doesn/'t explain the "why" that I'd like. (TCS only allowed vacuum advance in 3rd gear. Not a clue as to what good that would do. Kind of like what good does ported vacuum do?)
Terrible One
12-23-2005, 01:05 PM
My shop manual ('76) has some pictures and descriptions. I'll do some scans or whatever as soon as I can, but I just got my wisdom teeth pulled yesterday and the painkillers, pain, and weakness really beats you up!
76Eldo_convertFI
12-23-2005, 01:47 PM
Maybe these will help. The 1st one; in blue is the AIR tube, green is the AIR check valve, light blue is the rubber hose from the AIR pump to the check valve & orange is where the tube fits into the heads.
76Eldo_convertFI
12-23-2005, 01:48 PM
N/T
STDog
12-23-2005, 02:52 PM
OK, so you have a '68 manual handy :)

The first one looks to me like a page from the GM shop manual anyway
The second one is GM as well, but I cannot make out the year. :(

Noti8ce the 68-69 and the 71-73 lable on the upper picture. That's why there is nothing on the system in the '70 manual.

I'm curious, so you have/had a '68 prior to the '76?