car falls on its face in 3rd.

by Dead Man Thu Oct 25, 2012 5:26 pm

well my car is a 73 ss 350 th350 trans, and I think it may have a very mild cam Im really unsure bought the car this way, I just about a week ago installed a Holley 600 4 barrel carb that replaced the stock 2 barrel. the car runs great in 1st and 2nd the secondaries open as they should and it does not bog just keeps climbing but as soon as you hit 3rd its like it goes flat, it dont sputter or anything it just feels like it falls on its face and the climbing stops. any ideals ?

by 77mali Thu Oct 25, 2012 6:28 pm

Dumb question but is the linkage for the trans cable on the carb hooked up correctly & for that matter the vaccum line to the trans? How was it running prior to the swap? I can't imagine it's the carb itself if its a new unit.

by Joe73 Thu Oct 25, 2012 6:31 pm

Was the carb new? How do you know the secondaries are opening? I'm assuming any trans linkage and vacuum source is connected correctly. The spring for the secondaries can easily be changed to match your vehicle. An assortment of springs are real cheap and real easy to install.

http://www.summitracing.com/parts/hly-20-13

Just keep putting in a lighter color spring until she bogs, then go one color stiffer and your good. Works great !!

by Dead Man Thu Oct 25, 2012 6:49 pm

77mali wrote:Dumb question but is the linkage for the trans cable on the carb hooked up correctly & for that matter the vaccum line to the trans? How was it running prior to the swap? I can't imagine it's the carb itself if its a new unit.

well to my knowledge there is no cable from the trans to the carb,before or after the swap the kick down cable is going through the firewall I believe to the gas pedal.( I think thats where its going anyhow).and yes the vacuum line is hooked up.and before the swap it was always on its face lol, it was a 2 barrel and ran good but not really any power to it.

Joe73 wrote:Was the carb new? How do you know the secondaries are opening? I'm assuming any trans linkage and vacuum source is connected correctly. The spring for the secondaries can easily be changed to match your vehicle. An assortment of springs are real cheap and real easy to install.

http://www.summitracing.com/parts/hly-20-13

Just keep putting in a lighter color spring until she bogs, then go one color stiffer and your good. Works great !!

well the carb is new,and I can hear the secondaries open up pretty good once up in the rpm range under load.and I bought the spring kit when I got the carb, im running the tall yellow spring right now I may switch it to the short yellow spring and try that, but it runs so well in 1st and 2nd I figured that was the spring to run.

by 77mali Thu Oct 25, 2012 7:11 pm

I'm not familiar with Holley's, sorry.

My Quadrajet has linkage for cables for the gas pedal and the speedo.

by 77ElClassic Thu Oct 25, 2012 7:43 pm

What manifold did you install?

by BlackChevelleSS Thu Oct 25, 2012 7:57 pm

My guess would be fuel pump. Maybe the larger carb is requiring more fuel than your pump is putting out and the bowls dont empty untill you get to third

by Dead Man Thu Oct 25, 2012 8:21 pm

Im running a summit racing stage 1 duel plane.and would the bowls not empty at the very top of second.as soon as it hits 3rd its like the rpm's just stall.

by pila Thu Oct 25, 2012 11:34 pm

What BlackChevelle said....fuel pump may be OK for a 2bbl, but may not keep up with your Holley. Did you check the float level on the new Holley?
Summit Racing has a Holley fuel pump that works fine for your Holley. Catalog # is HLY-12-834
I have one, feeding a built 408 small block, and it does the job OK.

by Dead Man Thu Oct 25, 2012 11:49 pm

pila wrote:What BlackChevelle said....fuel pump may be OK for a 2bbl, but may not keep up with your Holley. Did you check the float level on the new Holley?
Summit Racing has a Holley fuel pump that works fine for your Holley. Catalog # is HLY-12-834
I have one, feeding a built 408 small block, and it does the job OK.

thanks man I will give that a go, will I have to adjust it down or anything or just slap it on and go

by pila Fri Oct 26, 2012 4:23 am

It will work OK right out of the box. Mine is feeding a Holley also.
Not to muddy this up, but there are other things that can limit fuel flow & volume, like the filter sock on the end of the pickup tube in the tank. Not a common thing, but it does happen.

Let us know if the problem gets solved, or needs more work.

by Dead Man Fri Oct 26, 2012 10:11 am

Will do.

by davesr_7 Fri Oct 26, 2012 10:47 am

lets look at this differantdo you still have the stock rear in it if so could be it flattens out because of that and a stock cam tops out at 5400 rpm and tends to go down hill from there a 353 gearing may help some and a step up in cam or try degreeing in your cam thats always good for some power

by Dead Man Fri Oct 26, 2012 12:57 pm

yes they are stock gears, I will be going to 373 soon. but after the car shifts to 3rd would it not drop below 5400 rpm and steady climb from there ?. I mean it climbs but much slower than it should, picture it like this lets say your in a normal 5spd car, this is how mine feels compared, 1st 2nd 4th.

by davesr_7 Fri Oct 26, 2012 1:35 pm

maybe you have a resticted fuel line or sock in tank clogged do you still have the old fuel caister chk it becareful sometimes the vent line that runs from canister to tank collaspes and thenit wont breath and cause strange things

by pila Sat Oct 27, 2012 3:09 am

Tossing the canister is not a good idea.
The 1/4 inch vent line from the tank can be checked by blowing air through it, back toward the tank. If that line is open, the fumes that come from the tank will come through the canister and be brought into the intake by way of the vacuum hose to the carb.
Open vent line in the engine compartment will usually have fuel fumes and smells. That's the purpose of the canister, to purge those into the intake.

The 1/4 inch line is rarely ever plugged, unless it's been open long enough to let debris get into it.

by JB2wheeler Sat Oct 27, 2012 7:43 pm

Maybe someone stuck a potato in the end of your exhaust pipe. JB

by pila Sat Oct 27, 2012 11:15 pm

Aaahhh..... JB ! you know about those tricks Very Happy

by 77mali Sat Oct 27, 2012 11:28 pm

In my day we used bananas.

by Dead Man Sat Oct 27, 2012 11:30 pm

love Beverly hills cop lol

by dragons_lair59 Mon Oct 29, 2012 12:55 pm

i would say its the pump also my old 77 with 305 2bbl swapped to 600 holley and wasnt there in 3rd then got ugly when i put a .060 350 in it ran like Turd

traded limey for a holley pump and man o man change your drawers big car flew lol

by Bruisr Tue Nov 20, 2012 10:44 pm

Did your holley come with sintered bronze fuel filter in the inlet side of the fuel bowl, check to see if its not clogged. Remove it and use a better fuel filter. Those types of filters are unforgiving to fuel flow.

by Dead Man Wed Nov 21, 2012 12:23 am

dragons_lair59 wrote: i would say its the pump also my old 77 with 305 2bbl swapped to 600 holley and wasnt there in 3rd then got ugly when i put a .060 350 in it ran like traded limey for a holley pump and man o man change your drawers big car flew lol

did you go with this one as well
http://www.summitracing.com/parts/hly-12-834/overview/year/1973/make/chevrolet/model/chevelle

by pila Wed Nov 21, 2012 1:56 pm

With that Holley pump, you will need the fittings to adapt the 3/8" line & hose with the inverted flare, to the 1/4"NPT threads in the pump.
I have that same pump on my Malibu, and it feeds the 408 small block OK.

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