Smog numbers, '72 LS5

[Brandon Metzger]

Hello all,
I need to buy a smog system for my '72 LS5 Feb build coupe. Could someone tell me the correct numbers I should be looking for for the pulley, pump, and misc.

You help is greatly appriciated. I can not seem to locate the info myself.

Thank you,
Brandon

[Joe L.]

Re: Smog numbers, '72 LS5

Brandon-----

1) pump bracket-----GM #3919890---discontinued; reproduction discontinued; part number NOT stamped on part;

2) pump brace-----GM #3921903---discontinued; reproduction discontinued; part number not stamped on part;

3) pump-----GM #7803948----discontinued 25 years ago; not reproduced; available rebuilt; no part number for the complete assembly is stamped on the pump; rear plate has casting number 7801149, but other pumps use this same plate;

4) diverter valve----GM #7029199---stamped "29199"; discontinued 25 years ago; not reproduced; BIG $$$$ anyway you get one;

5) diverter valve elbow----GM #3951346 or 3947728----discontinued; not reproduced;

6) check valves----GM #5361992----stamped "5361992"; discontinued; not reproduced; replacements and "reproduction" available;

7) pump pulley----GM #3925522----part #stamped on pulley; discontinued; reproduced;

pump pulley spacer-----none used

9) manifold "tree", left side----GM #3999267----part number NOT stamped on part; discontinued 25 years ago; reproduced;

10) manifold "tree", right side----GM #3981064----part number NOT stamped on part; discontinued 25 years ago; reproduced;

11) extension tubes (8 required)----GM #3882805---discontinued; reproduced;

12) exhaust manifold, left side ----GM #3969923----cast "3969869" with AIR fittings; discontinued; reproduced;

13) exhaust manifold, right side,---GM #3880834---cast "3880828" with AIR fittings; discontinued; reproduced;

14) hose from diverter valve to check valve, left side,----GM #3932476; never available in SERVICE; reproduced;

15) hose from diverter valve to check valve, right side---GM #3947740; never available in SERVICE; reproduced;

16) carburetor, 4 speed---- GM #7042217; THM-400----GM #7042216; [an AIR-specific carburetor is part of the AIR system].

[Brandon Metzger]

Re: Smog numbers, '72 LS5

Everything and then some. Much appriciated Joe.

All '72 BB were with AIR so souldn't the 7042216 carb already be spec. for AIR?

Does the pump have a date code.

Thnak you,
Brandon

[Cary Lewis]

Re: Smog numbers, '72 LS5

Brandon I recently purchased a complete system like Joe described for my '74 LS4 from Bill Hodel, all rebuilt to show quality, all correct down to the dates on the tower clamps. He has an add in the Drive Line but in case you don't have that call him at 330-832-0871, you might want to be in the sitting position when he gives you the price,I think it's worth it. Tell him I said hello!~
Cary Lewis

[Joe L.]

Re: Smog numbers, '72 LS5

Brandon-----

Yes, that was the carb the car should have. However, sometimes when folks remove AIR, they may change carburetors, too. Whether as part of the change, or not. Without the AIR installed, if a carburetor is changed at any time a non-AIR carb might be installed.

The pump does have a julian date code stamped on a "half-moon" shaped machined surface of the pump's aluminum body.

[Brandon Metzger]

Re: Smog numbers, '72 LS5

I have called him and thankfuly I was sitting down. I am not in a rush at all so I have some time to look around. In the end I probably will be calling him.

Regards,
Brandon