as you can see on the pic i made below, the TBI bores are slightly covered on the edges by a standard holley squarebore pattern.
for a actual pic of this, click here: http://www.mez.co.uk/dcam/11050005.JPG

my idea is pretty simple... turn the TB to a angle so that you get more uncovered surface area.

this would require a custom TBI to carb flange adapter, and some tweeking on the lines, but it appears to be totally doable...



ofcourse, i dont have TBI anymore, so i cant do it myself.. i just thought id throw it out there....

 

problem is, at part throttle it wlil direct the fuel to only 1 bank.

and would only work with a single plane.

 

obviously it needs a single plane intake.... but what do you mean by only one bank at part throttle?

both bores open at the same time.... and with a common plenum like with a single plane intake, that isnt a problem.

 

if your going to go through all that trouble why not just buy some 1/2" aluminum plate and drill, hone that? be alot easier... at least I think it would be.

 

thats what im suggesting.

instead of having the TBI mounted straight, drill/hone a plate so that its at a 45* angle..


keep in mind, im doing this off memory, so i might be remembering wrong, but i think most square bore manifolds were too thin/close on the edges to bore straight down to make clearance... if thats what you're implying.

 

i think the angle of the butterfies direct the fuel in a specific direction at say 1/4 throttle. they(inj) spray on the blades and the flow is not uniform to all runners. by moving the injectors 45 deg. it would appear the right passanger "bank" would get more fuel at part throttle. not a problem at full throttle however but how often does one run full throttle? function as a diverter as that is why some TBI adapter plates have an offset. i think mine is about 1/4 to 5/16 inch offset.

 

when my 7.4L TB was mocked up over my single plane it was obvious that the plate bore(s) is larger than the width of the weiand. several options exist to help the situation. i question if this is really that big of a deal? if i grind on the manifold sealing surface i may have a potential vac leak as sealing surface is reduced by at least half. some spray may settle on the ridge but will it result in any discerable tuning/performance issues? after all pulling 600 cfms over that ridge should pull some wet into the mix.

 

A spread-bore intake with a slightly offset adapter fits the larger tbi quite nicely as its nearly the same size as teh secondaries on a q-jet. The only problem is the intake selection is more limited, although I hear the ZZ4 intake is supposed to be a good intake for mild street motors.

I think the end may not jsutify the means given that everything has to be relocated and the fuel lines rebent or new ones run all together. The tbi can be accomodated by just grinding and smoothing the area that obstucts the bores along with a decent adapter/spacer there as well it shouldnt pose much of a restriction.

 

I think the offset is to put the tbis throttle shaft in the same place as those of the throttle shaft for the primaries on a carb so the linkages hook up. I know at least the holley adapter was most likely meant for retrofits into older carbed vehicles.

As for the injectors, use some pod gaskets or a pod spacer to raise the injectors up enough so that the majority of the spray hits the walls and not the throttle blades. Itll give better fuel dist.