air pump/smog pump delete

Rocky454SS · Oct 27, 2018

Ok guys I am bringing this one back from the dead. My truck is a 1991 454SS. Do I have to get a delete pulley or can I just get a shorter belt? Looks like I can just go with a shorter belt, but I may be wrong. Any idea what size belt? Even with the pulley what size belt or is that in the instructions. I have been searching for a week with no confident answer.

Schurkey · Oct 28, 2018

There's no good reason to delete the AIR pump. It takes almost no power to drive it, it supplies extra O2 that helps the catalyst live a long life, and reduces harmful tailpipe emissions.

There's pretty-much no downside as long as the diverter valve is working.

454cid · Oct 28, 2018

Do all the TBI 454's have the air pump? On the Vortec 454 it's only the CA Emission engines.

Rocky454SS · Oct 28, 2018

I do not know if they all do. I just want it gone to clean up my engine bay

Schurkey · Oct 29, 2018

Rocky454SS said:
I just want it gone to clean up my engine bay

Shut the hood, and you don't need to "clean up the engine bay."

Rocky454SS · Oct 29, 2018

Thanks for the help

geeeee89 · Oct 19, 2020

Hey man did you make any progress on this? Needing to do the same to my TBI 454

Chevy66driver · Feb 24, 2021

So it looks like the pulley that is already there will work on mine, an '88 silverado ext cab, long bed, 5.7.
I just need to figure out the correct belt size now... I don't have cats so I don't need the air pump. I think it is making my belt squeak anyway.

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geeeee89 · Feb 24, 2021

Chevy66driver said:
So it looks like the pulley that is already there will work on mine, an '88 silverado ext cab, long bed, 5.7.
I just need to figure out the correct belt size now... I don't have cats so I don't need the air pump. I think it is making my belt squeak anyway.

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I just measured the new belt routing with a piece of string and went to the parts store and said "I need a belt this long"

Steven Petersen · Feb 24, 2021

ameadows7 said:
I just measured the new belt routing with a piece of string and went to the parts store and said "I need a belt this long"

You should be able to look up the part number by application. My 88 has that sticker too, which clearly shows some models came without the AIR pump.

air pump/smog pump delete

Rocky454SS

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Schurkey

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454cid

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Schurkey

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Rocky454SS

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geeeee89

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Chevy66driver

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geeeee89

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Steven Petersen

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