[DIYGuy]

I am about to drop a rebuilt 455 with a Comp Cam 268H grind cam into my '70 LeMans Sport convertible, which was equipped with a 350-2bbl.

This is a mild street engine - driveability and good torque is most valued.

I have an Edelbrock Performer aluminum manifold, but have not yet acquired a 4-bbl carburetor for the new motor.

I would like to maintain the original throttle cable and choke linkage setup if possible, just because I'm a tad lazy and prefer not to mess with existing setups. I'm considering using a Quadrajet (I have had good experiences with them in the past)

I have seen that Edelbrock, Jet, and others offer 'remanufactured' Q-jets,

http://www.jetchip.com/fuel/streetmaster750.cfm

Edelbrock: Specifically states that they are NOT for non-chevy applications:
http://www.edelbrock.com/automotive/carb_qjet.html
http://www.edelbrock.com/automotive/carb_qjet_ref.html

but I'm not sure these have the same fuel inlets and linkages as the Pontiac setups. Or is it just that the jetting is different?

Is this 'doable' - how hard is it to find Pontiac-specific Q-jet carbs from the local parts counter?

Is it a major pain to make the non-pontiac versions work on a pontiac setup? Or is it just a matter of getting the right linkage bracket from PY? (I see that there have been references to these in various forum posts.)

If not a Q-jet, are there any other carbs that are recommended in the 750-800 CFM range?

Thanks for any constructive feedback!

-Mike

[DIYGuy]

I am about to drop a rebuilt 455 with a Comp Cam 268H grind cam into my '70 LeMans Sport convertible, which was equipped with a 350-2bbl.

This is a mild street engine - driveability and good torque is most valued.

I have an Edelbrock Performer aluminum manifold, but have not yet acquired a 4-bbl carburetor for the new motor.

I would like to maintain the original throttle cable and choke linkage setup if possible, just because I'm a tad lazy and prefer not to mess with existing setups. I'm considering using a Quadrajet (I have had good experiences with them in the past)

I have seen that Edelbrock, Jet, and others offer 'remanufactured' Q-jets,

http://www.jetchip.com/fuel/streetmaster750.cfm

Edelbrock: Specifically states that they are NOT for non-chevy applications:
http://www.edelbrock.com/automotive/carb_qjet.html
http://www.edelbrock.com/automotive/carb_qjet_ref.html

but I'm not sure these have the same fuel inlets and linkages as the Pontiac setups. Or is it just that the jetting is different?

Is this 'doable' - how hard is it to find Pontiac-specific Q-jet carbs from the local parts counter?

Is it a major pain to make the non-pontiac versions work on a pontiac setup? Or is it just a matter of getting the right linkage bracket from PY? (I see that there have been references to these in various forum posts.)

If not a Q-jet, are there any other carbs that are recommended in the 750-800 CFM range?

Thanks for any constructive feedback!

-Mike

[Randy Frazier]

Don't buy a quadrajet from one of the chain parts stores. They are often butchered and the needle and seat assembly is sometimes converted to a press in kind with O-rings. The metering rods are most of the time generic and made of cheap material. If you are going to go to the trouble of replacing the manifold, get a good carburetor from a reputable source. The q-jet is a good choice but not if it has been whacked on by a cheap rebuilding service.

[DIYGuy]

<BLOCKQUOTE class="ip-ubbcode-quote"><font size="-1">quote:</font><HR>Originally posted by Randy Frazier:
Don't buy a quadrajet from one of the chain parts stores. They are often butchered and the needle and seat assembly is sometimes converted to a press in kind with O-rings. The metering rods are most of the time generic and made of cheap material. If you are going to go to the trouble of replacing the manifold, get a good carburetor from a reputable source. The q-jet is a good choice but not if it has been whacked on by a cheap rebuilding service.<HR></BLOCKQUOTE>

Thanks for the info - which confirms what I've already thought.

Now, if I could get a response to the original question about fuel inlet and linkage compatibility...

<img src=http://www.exodus-dev.com/teletactics/personal/cars/images/tn_LeMans_edges.JPG>

http://www.teletactics.com/personal/...ans/index.html

[carbking]

DIY - I didn't answer your question when you posed it, as we have never had an edelbrock Q-Jet in our shop; and therefore have no first hand experience. But rereading a number of posts from Cliff, and others; I believe that all of the edelbrock Q-Jets are side inlet.

Maybe Cliff will jump in here and post.

Jon.

Good carburetion is fuelish hot air.

[Lloyd-TX]

Mike:

Do yourself a REALLY big favor and use a Q-Jet. I'd look for a good used or NOS '68 - '71 year carb to have the best compatibility with your throttle cable, etc.

Hopefully carbking or Cliff R. will jump in here with more and better advice than I have.

I see ads in Hemmings, POCI, etc. for Q-Jets all the time. Be prepared to spend some serious $$$ for a really good used/reman carb from a reputable source, or even more $$$$$ for a NOS unit. But in my opinion, it's the best way to go.

To prove that I practice what I preach, here's a pic of the '73 SD Q-Jet 455HO in my Formula. See sig below for performance numbers.

Hope this helps,
Lloyd

'72 Formula 455 - TH400, 3.08 posi, A/C, Y99 suspension, tach & gauges, AM-FM stereo, 8-track, Formula steering wheel, etc.; Lucerne Blue with Medium Blue deluxe Interior; 12.96 @ 104 MPH @ the '03 PSN's

Someday I'll be restoring a '72 GTO 455HO, TH400, A/C, etc.; Sundance Orange with Parchment buckets

[Lloyd-TX]

Jon:

That's what I've also heard concerning the Edelbrock Q-Jets - side fuel inlets (chebbie style) only.

Lloyd

'72 Formula 455 - TH400, 3.08 posi, A/C, Y99 suspension, tach & gauges, AM-FM stereo, 8-track, Formula steering wheel, etc.; Lucerne Blue with Medium Blue deluxe Interior; 12.96 @ 104 MPH @ the '03 PSN's

Someday I'll be restoring a '72 GTO 455HO, TH400, A/C, etc.; Sundance Orange with Parchment buckets