Ok, I found a Holley 670 TBI unit for sale for a really good price but the guy that is listing it says that list # 80418 is stamped on the top. I can't seem to find anything remotely like that number on Holley's site, do any of you know which throttle unit this is?

If you look at the pic it has no IAC and the TPS is sideways.It looks like the TBI for their stand alone Pro-Jection. The one you need has the TPS (connector going straight out ) and the IAC.I just bought a new Pro-jection for a 350 506-7 it has these casting nmbers on it .Right were is says Holley - L80405-1 and 3432 underneath it on the injector pod 34R 1109 B or 8 ? it is hard to make out.Hope this helps.

Ok thanks man, I thought it looked a little different and knew that buy it now price must have been too good to be true for anything I'd want.

What all is involved in altering the stand-along projection unit to accept standard TBI ecm? Looks like the casting is there for the IAC and just needs to be opened up and threaded. The TPS
should be a direct swap. (same bolt pattern/shaft)


(Or am I completely out in left field?)

i looks like it would be more work then its worth. Not only will you have to ghetto rig the linkages but youll have to drill it out. The machinists fees/cost of large drill bit + price of large diameter tap will really nullify any savings you made on the tb. There is also the small fact that it has to be drilled almost perfectly straight and dead center or the pintle in the IAC wont seat properly and will leak. I also beleive that the seat for the pintle will ahve to be finished to a smooth surface as well. If you get it for free it might be worth it but otherwise pass on it and get one of the oe replacement/454 tbis.

It's sitting in a box - got it for next to nothing

Id definatly say its worth it then if you got it for next to nothing. The machinists fees shouldnt eb too bad jsut to drill a centered hole and tap it. I suppose if your really industrious you could make a jig of some sort so you could get the hole to be straight and centered.

Let's explore this a little. I remember you had to get creative with
your TBI unit. Can I play mad scientist and use peices of the
stock TBI's linkages?

yep, ya sure can. There are lots of ways of doing it. Keep in mind i had to shorten my cables. This may not apply to you. the way i did it was to first recrimp the tv cable connector. I went out and bought solderless aluminum crimp connectors from radioshack adn shortened the tv cable to the desired legnth and with my crimping tool that i liberated i crimped one of the aluminum tubes to hold the connector on. For the throttle, i bought a locar universal cable. I drilled out the post for the throttle cable (not that bad if you ahve access to a drill press, takes like 2 minutes) and mounted up the locar cable. It has a bult in balljoint taht bolts in place really slick IMO because it allows teh cable to be at an angle without affecting smoothness of operation. At first i wasnt happy with the locar cable as the part of the housing that bolts to the firewall is at the wrong angle and the cable didnt line up with the gas pedal. I took the cable out of the locar housing and took the plastic thing that hooks the throttle cable to the gas pedal and put that in place of the locar connector and passed the locar cable back through the firewall. I then put the stock throttle cable sheth back in place and passed the cable back up through that and presto, the cable fit jsut like it did stock without any binding. Beware, though, that the gas pedal will no longer touch the floor at WOT. regardless of what cable you use. To remedy this, i set the cable up at WOT so the gas pedal bottoms out agaist metal rather then transmitting all the load to the tb shaft and cable. I broke my stock cable for this reason. There will be some slack in the gas pedal (not noticable unless you pull on the pedal) but it beats breaking something when i floor it. Heres a link to what i did. ZRATED also gave a link to his solution as well as some of what others did in my linked thread. Either will work. The only thing i woudl do if you did it his way is to spot weld the bracket onto the shaft. More permenant solution and no risk of it (the screw) coming off. If you do it my way i highly recommend getting an adjustable cable for the throttle. Makes life alot easier.

What i said above sounds like alot of work but it isnt. You could probably do it all in under 30 mins., if even that.

link

I can swing that
This is gonna be sweet