67 400 HP conversion to aftermarket intake & carb

[Curt S.]

Re: 67 400 HP conversion to aftermarket intake & carb

I like patrick's solution. Also, I have 2 3x2 cars both sets of carbs were redone by Holley. I believe their process is very comprehensive especially making sure all flat surfaces are and their recolor is excellent. One set has been running for two years the other five years. I check them often but have only wiped and cleaned the surfaces. It is my opinion , any set up will need checking and service from time to time. Hope this helps.

[Peter M.]

Re: 67 400 HP conversion to aftermarket intake & carb

Thanks Joe.

[William F.]

Re: 67 400 HP conversion to aftermarket intake & carb

Are you using the newer blue gaskets and genuine holley parts? They work much better than the older style "brown" paper gaskets? I don't have leaks on my Holley's (4bbl) with these gaskets and you shouldn't either unless parts of you carbs are warped. Whose rebuilding your carbs? Jerry McNeish, Bob Kunz and Eric Jackson get high marks on this forum; some other rebuilders, not so much.

[Gene M.]

Re: 67 400 HP conversion to aftermarket intake & carb

Wiend not sure of spelling makes a manifold for 4 barrel (carter or holley) that is regular two plane. But I can't say if it is low enough to fit under the mid year hood. I have one on my Nomad. It has oval port aluminum Edelbrock heads on it.

The manifold is an old design and may be an issue finding one.

[Joe L.]

Re: 67 400 HP conversion to aftermarket intake & carb

Wiend not sure of spelling makes a manifold for 4 barrel (carter or holley) that is regular two plane. But I can't say if it is low enough to fit under the mid year hood. I have one on my Nomad. It has oval port aluminum Edelbrock heads on it.

The manifold is an old design and may be an issue finding one.

Gene------


Obtaining a rectangular or oval port manifold with a square bore flange (i.e. Holley, Carter) is not difficult. GMPP, Edelbrock, and Weiand all offer them, although few, if any, will fit under a C2 or C3 hood. The real problem is finding a rectangular port manifold for a Q-Jet. I know of none. As far as an aluminum, low rise, oval port manifold for a Q-Jet that will fit under a C2 or C3 hood, the only ones I know of are the 68-69 L-36 manifolds and the Edelbrock Torker II. The latter is a single plane manifold that I do not recommend for the street.

[Russ S.]

Re: 67 400 HP conversion to aftermarket intake & carb

If you are driving the car as you state you want to, then the gaskets shouldn't dry out. In a situation like this, If I was putting wrong parts on the engine, I would go with aftermarket fuel injection. It would get way better milage.

I rebuilt them, had them rebuild, tried many types of gaskets. They leak at the fuel bowls after they sit for a while (and dry out & shrink). Also at base gaskets on secondary's and even the accelerator pump.

Many 400 HP cars were lost to engine fires from these carbs.

[Timothy B.]

Re: 67 400 HP conversion to aftermarket intake & carb

I don't think the fire issue is any different on the tri power engines vs the 4150/4160 Holley engines. Many carburetor problems described above are simply uneven surfaces not sealing and sometimes this is caused by over tightening the fasteners. Base gasket leaks can be the metering plate sandwich not sealing causing fuel to leak into the carburetor through the transfer slot and run out the side of the throttle shaft.
If finding a intake manifold is that difficult I would not give up on the Holley's. There is a learning curve for sure but my experience is that you can get them to run pretty well.

[Stephen G.]

Re: 67 400 HP conversion to aftermarket intake & carb

Joe

Whats the model number Q Jet I'm looking for ?

Steve

[Joe L.]

Re: 67 400 HP conversion to aftermarket intake & carb

Joe

Whats the model number Q Jet I'm looking for ?

Steve

Steve------


For your purposes you don't need to go looking for any particular model Q-Jet. That's a huge benefit since as a result you don't need to pay a ridiculous price just to get a certain "number" and date. I would look for just about any 1966-69 Q-Jet, preferably originally from a big block application. This could include truck carbs, passenger car carbs or whatever. Even a small block carb will work OK, possibly re-jetted. So, there are lots of carb part numbers that will suit your purposes.