Source for TBI throttle blades? HELP???
#1
Source for TBI throttle blades? HELP???
Need a source to buy throttle blades, screws and potentially a new shaft or two.
I have literally spent the past 3 months trying to find a source for the throttle shaft and blades for our TBI units.
I know they are out there, but no one will offer where to get them. I have spoke with NUMEROUS carb rebuilders and they are "clueless" about the GM TBI units.
I have several units that I want to bore. Two of them are the 50mm 454 and I want to bore them to 54mm. The other two are the stock 1 11/16" 42mm and I want to bore those to 46mm.
CFM-tech, xtremefi, turbo-city and MANY others do this all the time, but yet they all state....... They put brand new blades in their bored units.....
Anyway, I'm a chiropractor and this is my HOBBY not a business and I want to do this for fun. It's not like a source for blades is a highly classified government project. they are just throttle blades, lol!!!
I have literally spent the past 3 months trying to find a source for the throttle shaft and blades for our TBI units.
I know they are out there, but no one will offer where to get them. I have spoke with NUMEROUS carb rebuilders and they are "clueless" about the GM TBI units.
I have several units that I want to bore. Two of them are the 50mm 454 and I want to bore them to 54mm. The other two are the stock 1 11/16" 42mm and I want to bore those to 46mm.
CFM-tech, xtremefi, turbo-city and MANY others do this all the time, but yet they all state....... They put brand new blades in their bored units.....
Anyway, I'm a chiropractor and this is my HOBBY not a business and I want to do this for fun. It's not like a source for blades is a highly classified government project. they are just throttle blades, lol!!!
#2
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Re: Source for TBI throttle blades? HELP???
Holley... or a supplier of Holley parts. throttle plates that is. 2.00 inch are off a Dominator. Shafts I did not know wear? Hardened steel. I have the suppier name phone address at home. Florida. Ship was like $2.00.
can you google Holley cab parts and see what shows?. Any local speed shop can order as well. Behling Racing Equipt here in WIS I bet has or can order 262.783.7474 They treat people very well. especially me when i did not know much about all this/that.
can you google Holley cab parts and see what shows?. Any local speed shop can order as well. Behling Racing Equipt here in WIS I bet has or can order 262.783.7474 They treat people very well. especially me when i did not know much about all this/that.
#3
Re: Source for TBI throttle blades? HELP???
Hey Ronny. Thanks for the info. No, shafts don't normally wear out. The problem is the removal of those dang throttle blade screws in the small block tbi units. I found out that you have to grind the bottom of the screw off first before you try to remove them. If you don't then every time you go to remove the screws they snap off and now you're stuck with a shaft that needs to be tapped and re-threaded!!!!
GM puts a "special" screw in those that is a "one time" use. They have a barb or something like that which does not allow it to be removed. I know this from experience and from a GM tech who worked in their upper division in the late 80's.
Thanks for the info my friend. See, now that was easy wasn't it? LOL!!!
GM puts a "special" screw in those that is a "one time" use. They have a barb or something like that which does not allow it to be removed. I know this from experience and from a GM tech who worked in their upper division in the late 80's.
Thanks for the info my friend. See, now that was easy wasn't it? LOL!!!
#4
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Re: Source for TBI throttle blades? HELP???
I am not recommending this. I dremeled off the front/ back of screw and drilled out screw with drill press and a tool fixture to hold shaft. I then retapped next size larger(english to metric?). then i cleaned with brake cleaner. then I used "high strenght" Loctite on new screw. requires heat to remove screw. high strenght loctite is reliable (?)
I guess pan B would be to countersink threaded on one side and then cut off screw and use a "rivet set" or ball peen to fatten screw and fill in countersunk area.
I guess pan B would be to countersink threaded on one side and then cut off screw and use a "rivet set" or ball peen to fatten screw and fill in countersunk area.
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#12
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Re: Source for TBI throttle blades? HELP???
Are all the Holley 2.00 inch the Dominator? I wonder now if I was told to order the Holley Dom and when I called to place order owner recognized it was for GM TBI appliacation and sent me right stuff. Or sent me un drilled like a blank. If you want I can check my folder of invoices and possibly find that supplier. I keep most everything.
#13
Re: Source for TBI throttle blades? HELP???
The plates they sent me were off the Holley TBI setup. I talked to (2) different reps from Holley. Not one of them could tell me jack squat about anything. So, I ordered two of the TBI plates. I was told by them that the Dominator would not be even close to fitting my application. So, who knows, lol
That would be great if you could check. Thank you!!!
That would be great if you could check. Thank you!!!
#14
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Re: Source for TBI throttle blades? HELP???
I would think that ALL 2.00 inch bores have an eliptical shape to the plates. So that being said the manufacturers use same shape BUT do the hole patterns vary from mfr to mfr? One would hope there is a industry standard. Now I bet GM uses a carb placement for the plates in TBI. and Holley as far as TBI may use something diff. Holley TBI may be odd duck. Holley carb plates may bolt up to GM stuff. Anywat Dan Plett(used name Lionsden) at crossfire forum will know for sure. I ordered the bore from him but I neglected to order plates. I sent to him just TB castings assuming it would come with plates. I again assumed he is just a machine shop and I need to order from carb part supplier. He has the knowledge. I just educated guess at some of this. I will locate receipt???
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Re: Source for TBI throttle blades? HELP???
they are NOT round. and the holes are offset a bit. i searched for these years ago when i was going to make a tb unit i designed that had 2.25 inch bores. billet 3 piece unit. never made 1 - shafts would be custom..
the shop that i guess mods all the nascar carbs wanted a TON of money to make the shafts and blades for me. nobody else had any clue how to cheaply make a lot of blades.
good luck. more than likely to be accurate they will have to be stamped out and that costs tooling. you arent going to be able to accurately make them by hand.
shafts. sure maybe you could make those though.
as for the screws. i think they are tac welded at the tips or pressed from both sides after they're screwed in. if you grind off the tips, then soak them in penatrating oil, then heat the shaft a bit, they SHOULD come out, but i've snapped a few off myself...
the shop that i guess mods all the nascar carbs wanted a TON of money to make the shafts and blades for me. nobody else had any clue how to cheaply make a lot of blades.
good luck. more than likely to be accurate they will have to be stamped out and that costs tooling. you arent going to be able to accurately make them by hand.
shafts. sure maybe you could make those though.
as for the screws. i think they are tac welded at the tips or pressed from both sides after they're screwed in. if you grind off the tips, then soak them in penatrating oil, then heat the shaft a bit, they SHOULD come out, but i've snapped a few off myself...
#17
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Re: Source for TBI throttle blades? HELP???
dctrumpet
Instead of searching high and low for replacement blades why not simply make them?? Let say you take accurate dimensions of the existing plate, figure out what material OE was using to make them and draw a sketch (I can easily generate a CAD drawing). I'll ask around on my end for some one with water jet and cut a whole lot of these plates.
As for the shafts, same thing - generate a drawing (or sketch)
It is worth a try.
//RF
Instead of searching high and low for replacement blades why not simply make them?? Let say you take accurate dimensions of the existing plate, figure out what material OE was using to make them and draw a sketch (I can easily generate a CAD drawing). I'll ask around on my end for some one with water jet and cut a whole lot of these plates.
As for the shafts, same thing - generate a drawing (or sketch)
It is worth a try.
//RF
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Re: Source for TBI throttle blades? HELP???
Any update on the 54mm blades? I'm in the process of boring out a 454 TB and would like to find the right blades with the right bolt holes.
Lou
Lou
#20
Re: Source for TBI throttle blades? HELP???
According to everyone that I have spoke with they are ALL "custom" made. No source for any TBI blades/plates so they say.
I am sorry, but I find it impossible to believe that everyone who is rebuilding these is having them "custom" made.
I gave up on the search after 4 months and 68 phone calls. Talked to carb guys, tbi guys, etc.
Sorry! If someone actually goofs up and tells me the vendor/s I will surely post it!! LOL!!!
I am sorry, but I find it impossible to believe that everyone who is rebuilding these is having them "custom" made.
I gave up on the search after 4 months and 68 phone calls. Talked to carb guys, tbi guys, etc.
Sorry! If someone actually goofs up and tells me the vendor/s I will surely post it!! LOL!!!
#22
Re: Source for TBI throttle blades? HELP???
More airflow never hurts, lol. I assume Lou will be putting that on a carb intake and not a TBI intake.
Edelbrock 3704 can be bored to 50mm without much trouble, but it's a 50/50 chance with stock 305/350 intakes.
I have bored 8 stock 350/305 intakes and 4 were successful to 50mm. THe others were ruined.
It is safe for almost all of them to be bored to about 47mm
Edelbrock 3704 can be bored to 50mm without much trouble, but it's a 50/50 chance with stock 305/350 intakes.
I have bored 8 stock 350/305 intakes and 4 were successful to 50mm. THe others were ruined.
It is safe for almost all of them to be bored to about 47mm
#24
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Re: Source for TBI throttle blades? HELP???
Ron said:
Are all the Holley 2.00 inch the Dominator? I wonder now if I was told to order the Holley Dom and when I called to place order owner recognized it was for GM TBI appliacation and sent me right stuff. Or sent me un drilled like a blank. If you want I can check my folder of invoices and possibly find that supplier. I keep most everything.
I forgot to look for receipt. I am certain I have it. I will look this weekend and post Monday. Dan Plett aka Lions Den over at crossfireforum I recall suggested I order 2.00 Dominator. That is what I did and they fit just fine. I am certain I just dropped the flys in TB let them lie on shaft and marked with Sharpie and drilled on press as the holes may not have lined up. Now he is the guy to run this ?? at. He has bored dozens and dozens of TB's including mine. He may have some in stock as well. I sold TB's about 3 years ago to another CF forum member.
Are all the Holley 2.00 inch the Dominator? I wonder now if I was told to order the Holley Dom and when I called to place order owner recognized it was for GM TBI appliacation and sent me right stuff. Or sent me un drilled like a blank. If you want I can check my folder of invoices and possibly find that supplier. I keep most everything.
I forgot to look for receipt. I am certain I have it. I will look this weekend and post Monday. Dan Plett aka Lions Den over at crossfireforum I recall suggested I order 2.00 Dominator. That is what I did and they fit just fine. I am certain I just dropped the flys in TB let them lie on shaft and marked with Sharpie and drilled on press as the holes may not have lined up. Now he is the guy to run this ?? at. He has bored dozens and dozens of TB's including mine. He may have some in stock as well. I sold TB's about 3 years ago to another CF forum member.
#25
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Re: Source for TBI throttle blades? HELP???
DC
I have couple SB TB's and one BB TB. One of these days, I would like to setup this BB TB to run with 700R4 (it came of HD manual truck) in C3 project.
As far as for boring out SB TB's to 50mm+ well, IMHO the fractional air flow gain is relatively small for a street driven car (or truck). Yes, I know, I am going to be shot for stating that!!! Instead of boring SB TB, BB can offer 625CFM that can satisfy almost any SB air flow requirements. For those who need more air flow - boring TB maybe an option or a quad TB setup might be the next step in the airflow search.
Another crazy idea that I had for a while is to somehow adopt Dodge TB to SBC intake. There are couple of outfits out there that build 'large throat' TB's for dodge trucks - F&B (2x46, 50, 53, 58mm).
http://www.fbthrottlebodies.com/products.htm#2x58
1) Building adapter plate is not that difficult.
2) TPS and IAC may require some work, but the CFM offered by these large TB's can be the ticket!
3) Throttle & TV cable linkage???
What do you think?
//RF
I have couple SB TB's and one BB TB. One of these days, I would like to setup this BB TB to run with 700R4 (it came of HD manual truck) in C3 project.
As far as for boring out SB TB's to 50mm+ well, IMHO the fractional air flow gain is relatively small for a street driven car (or truck). Yes, I know, I am going to be shot for stating that!!! Instead of boring SB TB, BB can offer 625CFM that can satisfy almost any SB air flow requirements. For those who need more air flow - boring TB maybe an option or a quad TB setup might be the next step in the airflow search.
Another crazy idea that I had for a while is to somehow adopt Dodge TB to SBC intake. There are couple of outfits out there that build 'large throat' TB's for dodge trucks - F&B (2x46, 50, 53, 58mm).
http://www.fbthrottlebodies.com/products.htm#2x58
1) Building adapter plate is not that difficult.
2) TPS and IAC may require some work, but the CFM offered by these large TB's can be the ticket!
3) Throttle & TV cable linkage???
What do you think?
//RF
#26
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Re: Source for TBI throttle blades? HELP???
I got tired of rebuilding the c*appy carb twice a year so I decided to put an FI system on it. It's easy, considering that I have access to the donor parts and I know how to tune the ECM.
Yes, I'll have to make an adapter for the TB to sit on the Ford intake but it's no big deal.
I just hope I can find the 54mm throttle blades!!
Lou
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Re: Source for TBI throttle blades? HELP???
More airflow never hurts, lol. I assume Lou will be putting that on a carb intake and not a TBI intake.
Edelbrock 3704 can be bored to 50mm without much trouble, but it's a 50/50 chance with stock 305/350 intakes.
I have bored 8 stock 350/305 intakes and 4 were successful to 50mm. THe others were ruined.
It is safe for almost all of them to be bored to about 47mm
Edelbrock 3704 can be bored to 50mm without much trouble, but it's a 50/50 chance with stock 305/350 intakes.
I have bored 8 stock 350/305 intakes and 4 were successful to 50mm. THe others were ruined.
It is safe for almost all of them to be bored to about 47mm
http://www.kinsler.com/page--HandbookCatalog--2.html
download catalog - handbook #31 and on page 25 they have listing of blades.
//RF
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Re: Source for TBI throttle blades? HELP???
Im working on grinding down the shaft now, doing the top of the tbi unit was cake, this shaft sucks major *(&#%(*%&@
I was gonna grind down the bottom of the screws and attempt to take off the blades, but i did not know these screws were one time users :/
I was gonna grind down the bottom of the screws and attempt to take off the blades, but i did not know these screws were one time users :/
#30
Re: Source for TBI throttle blades? HELP???
Yeah the "F" word became a big part of my vocabulary the first time I attempted a 5.0/5.7L TBI. The 7.4L are a piece of cake.
I believe the throttle shaft screws that hold the throttle plates in place are 3.5mm for the 7.4L and either 2.5mm or 3.0mm for the 5.0L/5.7L TBI units.
Be sure to use the permanent Lock-Tite to put the screws in. Not the standard lock tite. When you put the new screws in they also will be permanent.
I believe the throttle shaft screws that hold the throttle plates in place are 3.5mm for the 7.4L and either 2.5mm or 3.0mm for the 5.0L/5.7L TBI units.
Be sure to use the permanent Lock-Tite to put the screws in. Not the standard lock tite. When you put the new screws in they also will be permanent.
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Re: Source for TBI throttle blades? HELP???
Permanent is good dont want those puppies getting sucked up. Helped a buddy of mine do his with the perm locktight on his Sentra SE R i think it was, was a defect from their factory, and i was like OH! i have those to, cept his just unscrewed so i figured the same.
Havent took them out yet, so that was good information to know
Havent took them out yet, so that was good information to know
#32
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Re: Source for TBI throttle blades? HELP???
I cannot find my invoices. I recall ordering the 2.00 "flies" from a distributor in Florida. They were Holley Dominator. I suspect I had to redrill for mounting. Cant recall. If so I drilled flies on drill press and used allen-socket screws after retapping shaft(went english to metric)and used PERMANENT(red) Loctite.
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