i have a 91 rs 305 auto tbi, an I was curious has anyone heard about tbi mods? about cutting metal off a ring around the injectors? an will a throttle body off a 89 chevy 350 work on my 91 305?

 

Screwing with the throttle body would be way down on my list of priorities. There's stuff you can do that will actually make a difference in the power output.

If you swap to the 350 throttle body, you you plan to keep the 350 injectors? The engine will run very rich if you do.

There's a pile of differences among the various years of throttle bodies and the sensors that attach to them. In general, the throttle body should interchange if you have the correct base gasket, but the sensors may not interchange based on the style of electrical connector.

Here's a difference between two 350 TBI units:

 

ok thanks....I was just woundering someone told me it would give me more power I thought they were stupid....im tryin to get more power out of my 305 an someone has done changed the thermostat to a 160 which I hate an upped the timmin but they upped it to much it now pulls on its own

 

its not stupid. as for a lot more power from tbi mods? no. better running and a little more power. yes! read the stickies above where you posted and start with those.

schurkey --good to know info on the differences.

 

If your car is running well with what you have now I would not touch the TBI other than installing a open air element or better yet a "fresh air" intake.
This is probably the best setup I have seen.
Then work on your exhaust by at least a 3in cat back with a Magnaflow cat.
Then changing you rear end gear ratio and install a posi.

 

When I was looking in to the TB ultimate mods I had the chance to buy one of this http://www.chevyhiperformance.com/te.../photo_05.html https://www.thirdgen.org/forums/atta...i-dsc08184.jpg from Tom Miller at Turbo City.

Very nice piece of work! I ended up using it on my DIY 360 https://www.thirdgen.org/forums/tbi/...imple-fun.html and it still works good.