67 4 speed carburetor

[daevans315]

 I've recently inherited a 1967 4 speed Avanti.   A partial restoration was started in the mid 80's but never finished.   So it sat on jack stands from about 87 till last August.

It's mostly complete but as part of the work done in the 80's, some newer 350 heads, amongst other things, were bolted into the original 327 block.  

I'm looking to put it back as original as I can so one question I haven't found an exact answer to is the carburator.   There seem to be a lot of similar 600 - 650 cfm carbs listed on the Avanti (and Corvette) sites for the 300hp 327.

It currently has a Holley 4777 in it which is close, and works for now, but as I gather the parts to put things back closer to original, I'd like to get the 'right' one.

 

Edited 1 hour ago by daevans315

[Gunslinger]

From RQA0057-RQA0257 Avanti used a Holley carburetor but I don’t have what model Holley.  Beginning with RQA0258 Avantis were equipped with a Rochester Quadrajet.  Prior to RQA0057 Carter AFB carburetors were used.  

Edited yesterday at 12:28 AM by Gunslinger

[Mel]

Very nice looking car!  If you're new to Avanti ownership, welcome!  These cars are an absolute joy and get looks, questions, etc., whether driven to a car meet or the grocery store.  Check this forum regularly for tips, help, etc.

My '66 327/300, originally with the Borg-Warner automatic, has the Holley 4160.  Your statement "... as original as I can..." is one thing, comfortable driving for distance is something else.  I had the GM 700R4 (automatic) transmission put in which has an overdrive.  If I were you, I'd investigate a manual with an overdrive -- 3100rpm at 70mph is a lot noisier, and a lot harder on the nerves, than 2200rpm at 70.

Good luck and keep us posted.

[daevans315]

The though about OD has crossed my mind even with the limited miles I've driven it. The Avanti is in the garage next to this one that also came with a 300hp 327.    It has been swapped from a 3 on the tree... To a 3 on the tree with a overdrive behind the 3 speed.  Making a very rare 6 speed in the column.    Id love to do something like that which would be bolt on with minimal mods and could be undone at some point easily.   

[Mel]

Nice '64!

Not to belabor the point, but I wouldn't worry about setting up some modification and be concerned as to whether you could undo it in the future, unless you were only doing the modification to see if you liked it.  Set the car up as you'd like and go from there.

I'd probably try to find some GM transmission Guru, unless you are one, and find a 4 speed with an overdrive with an electric control, if such a setup is available.  That way, you might be able to keep the original 4 speed setup inside the car.

Sounds like a very interesting project.  Again, keep us posted.  Good luck!

[daevans315]

So back to the carb.    I've seen a some other consensus around the 4160 but there are still some options.    Vacuum secondaries?   Choke?

[daevans315]

4 hours ago, Mel said:

Nice '64!

Not to belabor the point, but I wouldn't worry about setting up some modification and be concerned as to whether you could undo it in the future, unless you were only doing the modification to see if you liked it.  Set the car up as you'd like and go from there.

I'd probably try to find some GM transmission Guru, unless you are one, and find a 4 speed with an overdrive with an electric control, if such a setup is available.  That way, you might be able to keep the original 4 speed setup inside the car.

Sounds like a very interesting project.  Again, keep us posted.  Good luck!

I have a t56 currently behind a 4.3 in a very tired s10.   It would also be a nice solution and a little googling seems to say the forward shifter position would be close to the stock location in the avanti.   But the stupid 4.3 won't die and everyone wants a mint for them now.   I picked the used t56 up for $200 when the 4L60e died.   I was appalled when I put t56 into Facebook marketplace search now.

One good thing about the SBC,  lots of options...