This may be posted somewhere here already, but I found it handy. I googled the part number on my injector, and this page was the first link. Great information
http://gmtuners.com/flow/

 

I can add to that, this is a video of injector testing before and after cleaning.

Found it interesting. Enjoy

 

Thanks for posting that. Good info to have. I didn't know the stock TPI throttle body flowed that much. Makes me believe my 52 MM TB is too big for my nearly stock 350 TPI. Problem is, I can;t find anyone that rebuilds the TB.

 

Why does your tb need to be rebuilt? leaking past the blades? Any good carb shop should be able to remedy that

 

Several online sources

http://www.ebay.com/itm/TPI-52mm-bored-port-throttle-body-85-92-Z28-TA-Corvette-/230426189214?pt=Motors_Car_Truck_Parts_Accessories&hash=item35a6789d9e&vxp=mtr

 

The butterfly shafts run direct in the alum housing , there are no bushes so eventually the alum wears oval and the blade is no longer sitting in the correct position
Typically observed as the RPM " hanging up " when the pedal is released because the butterflies jam on the side of the bore and the pedal needs a hard tap in order to break them free and the idle to drop down.

Aftermarket rebuilders drill the shaft hole out and install bushes to correct the problem ( and make the TB last much longer )

 

Thanks for the link Vetteoz. I got two stock TBs and on both the shafts wobble.