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Need Carb Advice

 
EricBrooks75 EricBrooks75
New User | Posts: 11 | Joined: 11/13
Posted: 11/27/13
07:23 PM

Having some problems picking a carb to buy. I was wondering what peoples thoughts were on it. I have a 350 in a 77 Monte Carlo (big A-Body) with a stock TH350 trans, stock gearing, Edelbrock Performer heads, Edelbrock dual plane intake, cam with a duration at 292 intake/302 exhaust, and a dual exhaust with an h-pipe (that was a trick). No idea what the VE is. I know the quadrajet that was stock was a 750, but I don't want to flood it out. Any ideas?  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/28/13
12:34 AM

650 to 750cfm will do fine.

Is that 292/302 advertised duration? If it is, the car will be a dog until it revs up to 2200ish rpms. Swapping in a higher stall converter will help out a lot. If/when you do that, install an auxiliary trans cooler too.

Flowmaster makes complete exhaust systems for 1st gen A-bodies that will fit on the 73-77 cars with no modifications other than a double hump cross member. As far as that goes, that same 1st gen A-body exhaust kit will fit on later model B-bodies too with a double hump cross member as the only real modification. I used Flowmaster #17107 (pipe kit without mufflers) on a '75 Monte Carlo and on an '88 Caprice wagon.  
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68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/28/13
12:39 AM

http://bangshift.com/blog/buford-t-justice-update-we-install-a-first-generation-chevelle-flowmaster-kit-on-our-9c1-caprice.html

Here's where someone else used Flowmaster #17119 kit with mufflers under a box B-body sedan.

http://www.bangshift.com/forum/showthread.php/45567-The-Blue-Turd(le)

This is my wagon build thread at BangShift. Currently working on the exhaust weather permitting as the Monte is in the garage and the wagon is in the driveway and I will not work in temps under 40*, call me whatever names you will, I don't care.  
68scott385 68scott385 68scott385

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/28/13
12:39 AM

double post

gotta love this forum  Frown  
68scott385 68scott385 68scott385

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/28/13
12:40 AM

Modified factory transmission cross member to accept dual exhaust. I had the U-shaped piece bent out of 1/2" material at a local metal shop for under $35, did the cut & weld myself.

7040 Zpscb31b9a9  
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EricBrooks75 EricBrooks75
New User | Posts: 11 | Joined: 11/13
Posted: 11/28/13
07:00 AM

The cross member was what did it.  We had to keep heating it up with a torch and shaping it out to oval it.  I couldn't find any exhaust systems that would work for that body type.  On the original y-pipe, the cross member was manufactured to fit it.  Luckily, my buddy has a small lift and welders.  He's not home much either, so getting that penciled in was rough.  Other than that, all the work I had to do with the engine in the car in the middle of winter.  I plan on putting a stall on it.  I would have to try to schedule it with the guy with the lift though.  A lot of this stuff is new to me.  Sometimes money is an issue too.  What is bangshift?  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/29/13
01:06 AM

BangShift is another forum, more members, wider variety of knowledge. Be very careful, it can be addicting. Smile I've shared my wagon there instead of here because of the decision to hold true to the General's engine/body assignment which is not as traditional as most would have it.

I know all about the winter thing. I'm still working on the exhaust for my wagon now. It sits outside and the garage isn't big enough to work on  a car in anyway.

G3GM.com is another forum that is specifically for 73-77 GM cars, lots of specific information there if you care to check it out.  
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EricBrooks75 EricBrooks75
New User | Posts: 11 | Joined: 11/13
Posted: 11/30/13
06:49 AM

Thanks.  I'll check out the G3Gm.com forum too.  I get a lot of parts from Jegs since they are right up the freeway about 5 minutes.  But even Summit and year one doesn't seem to have much for anything 73-77.  For that matter neither does Original Parts Group.  It'll be good to hear from other people with the same problems.  For the most part, the car is in great shape, but finding vinyl top clips was hard and OPG said no one manufactures them now.  You have a 75 Monte Carlo?  I like those a lot too.  My dad had one when I was a kid.  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/30/13
10:59 AM

Yes, I have a '75 Monte, bought it in 1988 to replace my '76 Monte, drove it for a few years then started working on it off & on. Parts are tricky to find but they are out there. What are you having trouble finding, maybe I can give you a place to look or a part number. I never considered replacing the vinyl top so all of those clips and the trim got tossed.  
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EricBrooks75 EricBrooks75
New User | Posts: 11 | Joined: 11/13
Posted: 11/30/13
08:12 PM

Finally did find the clips from a guy in Arizona.  But even looking for aftermarket stuff like a-pillar gauges just isn't happening.  It was the same way with dual exhaust on that body type.  One other question I had once I got to looking at stall converters (that I can't afford yet), was what size do I need?  I'd never done any in-depth engine work at all until I tore into that one.  I have had the 77 since I was 16, and never had a garage to keep it in or money.  When my dad passed away and my mom sold the house, my wife and I had the garage built so we could get out from under storing the car.  This is all pretty new to me.  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/30/13
11:54 PM

The easiest thing to do, IMO, would be to use a cam with an intake duration @ .050 in the 204-214 range. That would be mild enough so that you wouldn't need  to use a stall converter, give plenty of good low end torque the would be work well with the factory rear gears, but it may not give a lumpy idle. The best thing to do IF you decide to buy a stall converter is to pick a company to buy from, then call their tech line, be prepared to answer their questions, and write any questions you can't answer so you can get the correct answer to them. There are many factors that play into a converter's stall such as engine size, engine torque output, weight of the car, and the rear gear ratio.

The Monte Carlo, Malibu/Chevelle, Cutlass, Regal, Grand Prix, and probably one other car form 73-77 are all on the same frame. All the suspension and brake components will swap. There are some minor differences in the rear ends but those are good differences, not bad ones. All the interior pieces should interchange too, unfortunately they are very hard to find. I haven't even tried to find A-pillar gauge pods, or if I did try I did not succeed. Back in the '80s I had a set of Stewart-Warner gauges that are just a little bit bigger than the warning light openings. I took a Dremel tool to enlarge the openings enough to fit the gauges. IMO it looked good but it did require some work to the big white plastic contraption behind the dash face.

I know where to find new door weather-stripping, glass squeegees, trunk weather-stripping, and door hinges. There's a place in Arizona, probably the same place you found, that has cars to part out.  
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68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 11/30/13
11:58 PM

Before you go changing anything, what are all the specs on that cam?

Advertised Duration? not real important...

Duration @ .050? real important...

Lift? with what ratio rocker arm? 1.5 or 1.6?

Hydraulic lifters?

Solid lifters?

Flat tappet or roller?  
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EricBrooks75 EricBrooks75
New User | Posts: 11 | Joined: 11/13
Posted: 12/01/13
07:19 AM

It says cam timing is @ .050.  Max lift is 109 degrees ATDC and 119 degrees BTDC.  Rocker Arm Ratio is 1.5.  They are hydraulic lifters and flat tappet.  

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 12/08/13
12:55 AM

Sounds like a fairly mild cam which means it doesn't need much of a stall convertor. Maybe 1500-1800rpm stall. Again, before buying a convertor, call somebody like B&M, TCI, PTC or any performance manufacturer and be prepared to answer all there questions. One of those companies should have a questionnaire on their website, so you have all the questions answered before calling the tech line.  
68scott385 68scott385 68scott385

68scott385 68scott385
Guru | Posts: 1990 | Joined: 10/09
Posted: 12/08/13
01:06 AM

http://www.tciauto.com/tc/tctransrecommendation/

TCI torque converter recommendation page.  
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