I plan on boring my stock TBI unit out to 1 13/16. Anyone know where I can purchase larger throtle plates for my TBI unit?

 

i actually have 4 48mm throttle plates, which is more like 1 7/8". If you want 2 or all 4 ill sell them for pretty cheap.

 

can you bore that size safely without breaking through to the vaccume passages?

 

Why such a wierd size. I would just go 2" and get it over with. It will support much more power and still be tunable.

 

Because that involves sleeving the stock TBI unit . Brian over at tbichips.com recomended I stay with the stock tbi unit and mod it vs going with a 454 unit.

 

I am pretty sure you can get 2" out of the stock one. There is a guy on ebay that does it.

 

1 7/8" is only 1/16th of an inch bigger than 1 13/16"

 

vjo90RS8: Yes it looks like I might be able to go to 1 7/8 without sleeving it. Its gona be close though. Were you able to accomplish this? I would be interested in buying throtle plates from you.

 

I bored mine out to 1 7/8". You will break into the vacuum passages that go to the two small holes in the trottle bores near the trottle blades. I pluged those pasages, they are for the charcoal canister which I'm not going to use anyway.

 

Yea I think thats what ill do. Maby fill them with an epoxy.

 

Anybody know where I can get a new throttle shaft and 50 or 51mm plates?

 

good question. I found someone that had some throtle plates to sell. I still have not found a retailer that sells throtle plates. Ill keep looking though.

 

i purchased mine from a place in Florida. i just did a search and found them. if you email me i can look up receipt at home. have you looked on holley web site? i am sure they have them.

 

http://www.braswell.com/prod_catalogs/prod_cat.htm

 

good luck with braswell, they seem to be stuck in the past a bit when i talked to them on the phone etc a few years ago... i tried buying some of their plates a while back, they dont take credit cards or anything like that, and they wanted something like 25 bucks a peice for each plate. - maybe they've changed now, looks like they found somebody who can do some nice cad work.. but i bet they're still a bit expensive.