any possible way

[Jeremy90]

everyone says that its not possible to carb a 3100 aluminum head engine but there has to be some way if anyone is aware of a way it would be greatly appreciated some info on it ive been told to use a 2.8 intake manifold but it doesnt look like it will fit does anyone know of any other way i cant afford a whole other engine and mine is still good so id still like to use it even if i have to custom fab an intake just would care more for a carb and distributor setup i know alot of the mgb guys carb the 3400 and the 3100 and 3400 engines are only slightly different any help would be appreciated

[Superdave]

There are no carb manifolds that will fit the gen 3 3100 (or gen 2) aluminum heads. You would have to make one.


the MGB guys go fuel injection, it's not that hard.

[Jeremy90]

actually from the forums i looked at quite a few of them went carb instead

[Jeremy90]

you wouldnt happen to know anybody who has or can do this would you?

[caffeine]

It would involve a custom distributor setup and a custom plenum at least.

[robertisaar]

i'd say custom lower intake even.... the longish LIM runners probably wouldn't due to well with fuel running throgh them.

[Superdave]

It's been done but i agree, the long runners of the LIM aren't suited for carb use.


If the MGB guys went carbbed then they did it with gen 1 iron heads, there are GM and aftermarket carb manifolds that will fit them. Not interchangeable at all with the aluminum heads though.

[Jeremy90]

guess im gonna have to look for an iron head 3100 then and go from there thanks for your help guys nice cars both of you btw

[Jeremy90]

would either of you happen to know what years the iron head 3100s were made?

[ericjon262]

would either of you happen to know what years the iron head 3100s were made?

there was no iron head 3100, the 3x00 motors are all aluminum head. the later(90-92 I think) 3rd generation F bodys had an iron headed 3.1 though.

[robertisaar]

yeah, 90-92 for the F-body iron head 3.1. the 93-95 F-body 3.4 is also a iron-head (gen 1) engine.

[trotterlg]

I have one. Larry

[ericjon262]

trottelg,

you really need to rotate that Q-jet 90*, you're not going to get optimal distribution with it that way at all, which will double hurt you since you are on an EFI manifold.

[trotterlg]

I know you keep telling me, but the primaries will either be offset to a bank or to the front or rear of the engine, I choose the offset to a bank so at least it will be even to every other power stroke, that, and the Qjet is built to run oriented fore and aft, so I guess we will see how it works out. Larry

[Jeremy90]

how did you go about doing that? looks like a pretty good setup a bit tall though but worth it