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Re: Underdrive pulleys for 5.3l
Look in summits truck guide. They sell under drive pulleys. Jegs does also. One other place to look would be ebay. Other ways to improve efficency would be a cold air intake, headers, and a hypertech/superchips tuner. All of these add HP, TQ and either leave fuel economy alone or improve it. Hope this helps.
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 - K&N cold air intake
- Functional cowl induction hood
- short tube headers
- Hypertech PP III
- 20" Helo Renegades wrapped w/ Toyo Proxes S/T
- Escalade instrument cluster
- TYC tail lights and corner lights
- Wet Okole seat covers
Some people see things as they are and say "Why?". I dream of things that never were and say "Why not.""
-George Bernard Shaw
"Mind over matter: If she doesn't mind, It doesn't matter"
-Nineball 
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