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1987 Chevy g20 smog pump #729823
November 15th 2017 7:36 pm
November 15th 2017 7:36 pm
Joined: Nov 2017
Posts: 5
OH
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CptTripps Offline OP
stranger
CptTripps  Offline OP
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5.7/350 I can't seem to find a replacement for my smog pump without having to wait a week or more for shipping. I don't have that kind of time. I have seen alot about bypassing the pump, also can't seem to find a dummy pulley for my engine. Can I use a smaller belt? If so, does anyone know what size belt I would need exactly?

Re: 1987 Chevy g20 smog pump [Re: CptTripps] #729831
November 15th 2017 10:06 pm
November 15th 2017 10:06 pm
Joined: Jun 2010
Posts: 13,420
Van Diego California
frscke1 Offline
frscke1  Offline

Joined: Jun 2010
Posts: 13,420
Van Diego California
Welcome to the site CptTripps ....

I dont know the answer to this one .


SUNSHINE VANS-VAN DIEGO
ADRENALIN BY THE GALLON & CHASIN RACIN
ONE FOR THE DIRT & ONE FOR THE STREETS
'93 CHEVY G30 454 4X4 SPORTVAN EXT 146" WB
'92 CHEVY G30 454 BEAUVILLE EXT 146" WB
Re: 1987 Chevy g20 smog pump [Re: CptTripps] #729846
November 16th 2017 10:50 am
November 16th 2017 10:50 am
Joined: Sep 2013
Posts: 690
Indiana
tuner4life Offline
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tuner4life  Offline
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Indiana
Did 1987 use a serpentine belt? My 1985 305ci has v-belts and was as easy as removing the pump and anything else related to it, plugging the holes, and throwing the pld parts in the trash. No extra belt necessary.

I deleted the EGR while I was at it.

If you have a serpentine belt and can re-rout the belt without using an idler in place of the smog pump, just use a string to figure the correct length for a new belt


[Linked Image]

Last edited by tuner4life; November 16th 2017 10:51 am.

[Linked Image]
1985 Chevy G20 305ci/4spd Manual
Re: 1987 Chevy g20 smog pump [Re: CptTripps] #729882
November 18th 2017 12:44 pm
November 18th 2017 12:44 pm
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CptTripps Offline OP
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CptTripps  Offline OP
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It is a serpentine, yes

Re: 1987 Chevy g20 smog pump [Re: CptTripps] #729885
November 18th 2017 2:49 pm
November 18th 2017 2:49 pm
Joined: Nov 2013
Posts: 963
West Texas
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Wedgy Offline
old hand
Wedgy  Offline
old hand
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Posts: 963
West Texas
Welcome to the site Cptripps!

I believe that Tuner may be right on the belt suggestion .
My 90 G30 454 is serpentine with no smog pump. Your application uses no idler pulley with no smog pump.

A/C, PS. No K19 air injection OE. Belt #14102103

An '87 California 350 will no doubt have a smog pump.
49 state? IDK, but it looks like there is an application.
Ask your parts guy, it should come up.
The Truth is out there.

Good Hunting!


"Who New? Blue"
1990 Chevy G30 454
Church Van, maternity division

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1988 Dodge B250

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Re: 1987 Chevy g20 smog pump [Re: CptTripps] #729888
November 18th 2017 6:18 pm
November 18th 2017 6:18 pm
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CptTripps Offline OP
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I took another trip to my auto part store, and luckily this time, the one guy there that really knows his stuff was working. Turns out they sell a belt specifically for bypassing the smog pump. Also, I do have an idler pulley, as well as the tensioner idler. Thank you guys for taking the time to try to help. I will be sticking around this site for sure, I've done some browsing here and find it quite interesting. Time for some cosmetic work on this American classic.

Re: 1987 Chevy g20 smog pump [Re: tuner4life] #729968
November 21st 2017 4:46 pm
November 21st 2017 4:46 pm
Joined: Jun 2017
Posts: 7
VAN BC
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tyteric Offline
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tyteric  Offline
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VAN BC
Originally Posted by tuner4life
plugging the holes,


Hey Tuner,

What did you use to plug the holes? same threaded hex head plugs?


2005 ASTRO CARGO LIFTED AWD
1989 G30 TBI CARGO with TMW
Re: 1987 Chevy g20 smog pump [Re: CptTripps] #729978
November 22nd 2017 9:24 am
November 22nd 2017 9:24 am
Joined: Sep 2013
Posts: 690
Indiana
tuner4life Offline
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tuner4life  Offline
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Joined: Sep 2013
Posts: 690
Indiana
Yeah, just pipe plugs. I took one of the old pipes to the parts store and just matched the threaded fitting up with a pipe plug, then bought 8 of them.


[Linked Image]
1985 Chevy G20 305ci/4spd Manual

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