I've got a 91 Acccord EX and was wondering what the stock tb bore is. I'm looking to upgrade and need to know what a new one needs to be bigger than.

Thanks

 

Welcome to Honda-Tech. Please read the Accord forum guidelines at the top of the page and familiarize yourself with the search feature in the upper right hand corner of the page. There is a wealth of information both in recent topics and in the archives. This topic has been covered several times. Search, research, and when you have a specific question, ask us.

Get an H22a or a H23a throttle body and portmatch it.
Try these threads...
https://honda-tech.com/zerothread?id=357833
https://honda-tech.com/zerothread?id=329080

 

you got lucky man, most people don't get such a nice welcome with a question like that. Welcome anyway.